Bird Migration Classic Reprint

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Migration of Birds (Classic Reprint)

Author : Frederick Charles Lincoln
Publisher : Forgotten Books
ISBN 13 : 9780266271321
Total Pages : 136 pages
Book Rating : 4.2/5 (713 download)

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Book Synopsis Migration of Birds (Classic Reprint) by : Frederick Charles Lincoln

Download or read book Migration of Birds (Classic Reprint) written by Frederick Charles Lincoln and published by Forgotten Books. This book was released on 2017-10-13 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Migration of Birds Frederick C. Lincoln's classic work on the Migration of Birds first appeared in 1935. It was revised in 1950 and has been out of print for several years, after selling over copies. Unfilled requests by many individuals, clubs, and institutions prompted the Office of Conservation Education (now the Office of Public Affairs) in the us. Fish and Wildlife Service to petition another update for reissue. This publication incorporates the results gathered by research biologists in the us. Fish and Wildlife Service to meet these requests. Lincoln's original intent was to present to the American public a summary of the facts on bird migration as they existed in the early 1930's. He wrote with a style that made the topic fascinating to the young and old, to the educated and uninformed, and to the ardent observer as well as the backyard watcher. An attempt has been made to retain this style, while incorporating material from often highly technical research efforts. Much of the content and organization of the original publication has been maintained, but new sections were added to incorporate recent concepts and techniques. Other concepts, known to be inconsistent with present knowledge, have been deleted. Because graphics are of utmost importance in this type of publication, most of the original figures were preserved and, where appropriate, new illustrations have been added. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The Birds of Colorado

Author : Wells Woodbridge Cooke
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.A/5 ( download)

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Book Synopsis The Birds of Colorado by : Wells Woodbridge Cooke

Download or read book The Birds of Colorado written by Wells Woodbridge Cooke and published by . This book was released on 1897 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Bird Migration (Classic Reprint)

Author : Wells Woodbridge Cooke
Publisher : Forgotten Books
ISBN 13 : 9781527870550
Total Pages : 62 pages
Book Rating : 4.8/5 (75 download)

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Book Synopsis Bird Migration (Classic Reprint) by : Wells Woodbridge Cooke

Download or read book Bird Migration (Classic Reprint) written by Wells Woodbridge Cooke and published by Forgotten Books. This book was released on 2017-10-26 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Bird Migration Nora - This bulletin discusses the subject bf bird migration. Or interest to nature students and to investigators of the economic relation of birds to agriculture. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The Migrations of Birds (Classic Reprint)

Author : Alexander Wetmore
Publisher : Forgotten Books
ISBN 13 : 9780265563052
Total Pages : 242 pages
Book Rating : 4.5/5 (63 download)

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Book Synopsis The Migrations of Birds (Classic Reprint) by : Alexander Wetmore

Download or read book The Migrations of Birds (Classic Reprint) written by Alexander Wetmore and published by Forgotten Books. This book was released on 2017-10-21 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Migrations of Birds The material included is based on study and ob servation on the part of the author during a period of more than twenty years. It is intended as a sum mary of present knowledge of migration, with the various factors that affect it in its broader aspects, without entering upon precise statistics of move ment for the many species involved. Such figures may be left for treatises of another character. After careful consideration of the subject the writer is profoundly impressed by the mass of detail regarding the movements of birds that has been assembled and the little that has been definitely ascertained regarding the underlying principles that control migration. There is much that remains to be established in this phase of the subject. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Report on Bird Migration in the Mississippi Valley

Author : Wells Woodbridge Cooke
Publisher : Forgotten Books
ISBN 13 : 9781527766457
Total Pages : 316 pages
Book Rating : 4.7/5 (664 download)

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Book Synopsis Report on Bird Migration in the Mississippi Valley by : Wells Woodbridge Cooke

Download or read book Report on Bird Migration in the Mississippi Valley written by Wells Woodbridge Cooke and published by Forgotten Books. This book was released on 2017-10-13 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Report on Bird Migration in the Mississippi Valley: The Years 1884 and 1885 The nomenclature adopted is that of the new Check List of the American Ornithologists' Union, with the additions and corrections contained in Ridgway's Manual of North American Birds, which, for tunately, became available just as this report was going to press. The number in brackets following each name is that which the species bears in Ridgway's Nomenclature of North American Birds, as published in Bulletin 21 of the U. S. National Museum, 1881. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Bird Migration in the Mississippi Valley

Author : W. W. Cookie
Publisher : Forgotten Books
ISBN 13 : 9780267862870
Total Pages : 128 pages
Book Rating : 4.8/5 (628 download)

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Book Synopsis Bird Migration in the Mississippi Valley by : W. W. Cookie

Download or read book Bird Migration in the Mississippi Valley written by W. W. Cookie and published by Forgotten Books. This book was released on 2018-02-05 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Bird Migration in the Mississippi Valley: Read Before the Ridgway Ornithological Club, November 8, 1883 In the following notes the plan has been to give first the weather record and the general notes from St. Louis, then the same from Jefferson, and lastly the combined notes on each species separately. The nomenclature used is the latest Smithsonian catalogue. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The Migration of Birds (Classic Reprint)

Author : T. A. Coward
Publisher : Forgotten Books
ISBN 13 : 9780332524849
Total Pages : 166 pages
Book Rating : 4.5/5 (248 download)

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Book Synopsis The Migration of Birds (Classic Reprint) by : T. A. Coward

Download or read book The Migration of Birds (Classic Reprint) written by T. A. Coward and published by Forgotten Books. This book was released on 2017-12-07 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Migration of Birds Knowledge Of Approaching Weather - Favourable and Unfavourable Conditions - Importance of Winds - Cyclonic and Anticyclonic winds-continental Migration. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Recensio Critica Automatica of the Doctrine of Bird-Migration (Classic Reprint)

Author : Otto Herman
Publisher : Forgotten Books
ISBN 13 : 9781333481896
Total Pages : 94 pages
Book Rating : 4.4/5 (818 download)

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Book Synopsis Recensio Critica Automatica of the Doctrine of Bird-Migration (Classic Reprint) by : Otto Herman

Download or read book Recensio Critica Automatica of the Doctrine of Bird-Migration (Classic Reprint) written by Otto Herman and published by Forgotten Books. This book was released on 2016-09-05 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Recensio Critica Automatica of the Doctrine of Bird-Migration It is the H. C. 0* alone which since that time has worked in a purely systematical manner, having in the course of ten years established numerous permanent observation-stations, the results of the work of which have been compiled and published, including, as far as possible, also investigations from other countries. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Studies in Bird Migration, Vol. 1

Author : William Eagle Clarke
Publisher : Forgotten Books
ISBN 13 : 9780266842798
Total Pages : 372 pages
Book Rating : 4.8/5 (427 download)

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Book Synopsis Studies in Bird Migration, Vol. 1 by : William Eagle Clarke

Download or read book Studies in Bird Migration, Vol. 1 written by William Eagle Clarke and published by Forgotten Books. This book was released on 2017-10-27 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Studies in Bird Migration, Vol. 1: With Maps, Weather Charts, and Other Illustrations A number of the stations visited had either never before been explored ornithologically, or only partially so, and as their bird-life is of considerable interest, a complete concise account of their feathered natives is afforded. During the many years devoted to this work I was the recipient of many acts of kindness, and have been laid under numerous obligations. For these, gratitude compels me to express my deep sense of the value of the services rendered and my high appreciation of them. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

A Discussion of the Origin of Migration (Classic Reprint)

Author : P. A. Taverner
Publisher : Forgotten Books
ISBN 13 : 9780266838357
Total Pages : 22 pages
Book Rating : 4.8/5 (383 download)

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Book Synopsis A Discussion of the Origin of Migration (Classic Reprint) by : P. A. Taverner

Download or read book A Discussion of the Origin of Migration (Classic Reprint) written by P. A. Taverner and published by Forgotten Books. This book was released on 2017-10-27 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Discussion of the Origin of Migration The methods by which birds find their way to far distant points, the manner of their migrations, etc., Iie without the scope of this paper, and will not be referred to here. Upon these points we all await the publication of the results of the investigations now in progress, when probably many obscure points will be cleared up. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Report of the Migration of Birds in the Spring and Autumn of 1887

Author : J. A. Harvie-Brown
Publisher : Forgotten Books
ISBN 13 : 9781396380709
Total Pages : 186 pages
Book Rating : 4.3/5 (87 download)

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Book Synopsis Report of the Migration of Birds in the Spring and Autumn of 1887 by : J. A. Harvie-Brown

Download or read book Report of the Migration of Birds in the Spring and Autumn of 1887 written by J. A. Harvie-Brown and published by Forgotten Books. This book was released on 2018-09-24 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Report of the Migration of Birds in the Spring and Autumn of 1887: Ninth Report (Vol. II, No. 4) The-returns relating to Scotland have been arranged by Mr J. A. Harvie-brown; for the East Coast of England, by Mr Cordea'ux for the West Coast of England, by Mr W. Eagle Clarke; and those for the Coasts of Ireland, by Mr R. M. Barrington and Mr A. G. More. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Records of Spring Migration of Birds at Urbana, Illinois, 1903-1922 (Classic Reprint)

Author : Frank Smith
Publisher : Forgotten Books
ISBN 13 : 9781528417679
Total Pages : 22 pages
Book Rating : 4.4/5 (176 download)

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Book Synopsis Records of Spring Migration of Birds at Urbana, Illinois, 1903-1922 (Classic Reprint) by : Frank Smith

Download or read book Records of Spring Migration of Birds at Urbana, Illinois, 1903-1922 (Classic Reprint) written by Frank Smith and published by Forgotten Books. This book was released on 2017-10-28 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Records of Spring Migration of Birds at Urbana, Illinois, 1903-1922 One important source of records was an artificially forested area Of about 15 acres, locally known as the Forestry, which is a part of the campus. During the first few years of the period discussed. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Birds of the Boston Public Garden

Author : Horace Winslow Wright
Publisher :
ISBN 13 : 9781332297931
Total Pages : 282 pages
Book Rating : 4.2/5 (979 download)

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Book Synopsis Birds of the Boston Public Garden by : Horace Winslow Wright

Download or read book Birds of the Boston Public Garden written by Horace Winslow Wright and published by . This book was released on 2015-08-05 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Birds of the Boston Public Garden: A Study in Migration My little book, I think, will readily speak for itself, and, therefore, seems to need no prefatory word from the author. But it is pleasant to express to the reader how interesting and delightful has been the work, in the nature of pastime, done in our Public Garden during the past nine seasons, and how agreeable has been the task of arranging and analyzing the notes made there. In the work I have been encouraged and aided by many friends. Occasionally the garden-circuit has been made with eager young ornithologists who, alert and sharpeyed, have given added spirit to the morning's observation. At some other times the companionship has been with those who were earnestly bent on gathering almost their first knowledge of birds and have joined their steps with mine to see and become acquainted with a few of the more common visitants. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Studies in Bird Migration, Vol. 2

Author : William Eagle Clarke
Publisher :
ISBN 13 : 9781332307708
Total Pages : 390 pages
Book Rating : 4.3/5 (77 download)

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Book Synopsis Studies in Bird Migration, Vol. 2 by : William Eagle Clarke

Download or read book Studies in Bird Migration, Vol. 2 written by William Eagle Clarke and published by . This book was released on 2015-08-05 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Studies in Bird Migration, Vol. 2: With Maps, Weather Charts, and Other Illustrations Studies in Bird Migration: With Maps, Weather Charts, and Other Illustrations was written by William Eagle Clarke in 1912. This is a 380 page book, containing 97435 words and 16 pictures. Search Inside is enabled for this title. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The Migration of Birds

Author : F. B. Whitlock
Publisher : Forgotten Books
ISBN 13 : 9780267695393
Total Pages : 148 pages
Book Rating : 4.6/5 (953 download)

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Book Synopsis The Migration of Birds by : F. B. Whitlock

Download or read book The Migration of Birds written by F. B. Whitlock and published by Forgotten Books. This book was released on 2018-02-03 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Migration of Birds: A Consideration of Herr Gatke's Views In a volume replete with interest, special prominence will be found attaching to the author's opinions expressed in the leading chapters relating to the direction, attitude, velocity, order, guid ing power, and meteorological conditions affecting the migratory ﬂight. The remainder of the work being chieﬂy occupied by notes on the various species visiting the island, under their separate headings. No one has perhaps more closely studied, or had better opportunities for the observation of the different phases ofmigration, than the veteran author; and the results of his fifty years or more of labour, as now presented to the notice of the ornithological world, are eloquent testimony to the untiring zeal and energy of an accomplished field naturalist. The Opinions he expresses, on the special department of ornithological science, for the study of which Heligoland is so pre-eminently adapted, will naturally have the greatest weight with all, and some in their admiration for the veteran observer have formed the opinion, that all, or nearly all of our previous conceptions, as to the direction, attitude and velocity of the migratory ﬂight, will have to be greatly modified or altogether abandoned in favour of those he sets before us. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Report on the Migration of Birds in the Spring and Autumn of 1884, Vol. 2 (Classic Reprint)

Author : John Alexander Harvie Brown
Publisher : Forgotten Books
ISBN 13 : 9780666832368
Total Pages : 202 pages
Book Rating : 4.8/5 (323 download)

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Book Synopsis Report on the Migration of Birds in the Spring and Autumn of 1884, Vol. 2 (Classic Reprint) by : John Alexander Harvie Brown

Download or read book Report on the Migration of Birds in the Spring and Autumn of 1884, Vol. 2 (Classic Reprint) written by John Alexander Harvie Brown and published by Forgotten Books. This book was released on 2018-03-03 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Report on the Migration of Birds in the Spring and Autumn of 1884, Vol. 2 The following Report contains a summary of investigations of the Committee re-appointed by the British Association for the Advancement of Science, at Montreal, Canada, in 1884, to consist of Professor Newton, Mr. J. A. Harvie Brown, Mr. John Cordeaux, Mr. W. Eagle Clarke, Mr. R. M. Barrington, and Mr. A. G. More, for the purpose of obtaining (with the consent of the Master and Elder Brethren of the Trinity House, the Commissioners of Northern Lights, and the Com missioners of Irish Lights) observations on the Migration of Birds at Lighthouses and Lightships, and of reporting on the same at Aberdeen in 1885. Mr. Cordeaux to be the Secretary. The returns relating to Scotland have been arranged by Mr. J. A. Harvie Brown; for the East Coast of England, by Mr. Cordeaux for the West Coast of England, by Mr. W. Eagle Clarke; and those for the Coasts of Ireland, by Mr. R. M. Barrington, Mr. A. G. More, and Mr. Eagle Clarke. Having obtained an additional grant from the British Association, we venture this year to add a new feature to our Report in the form of a sketch-map, showing all the stations in red. We have done this at the intelligent request of several of our reporters and the map has been executed for us by Messrs. Macfarlane Erskine, of St. James' Square, Edinburgh. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The Ridgway Ornithological Club of Chicago, Illinois, U. S. A, Vol. 1

Author : W. W. Cooke
Publisher : Forgotten Books
ISBN 13 : 9780267695188
Total Pages : 46 pages
Book Rating : 4.6/5 (951 download)

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Book Synopsis The Ridgway Ornithological Club of Chicago, Illinois, U. S. A, Vol. 1 by : W. W. Cooke

Download or read book The Ridgway Ornithological Club of Chicago, Illinois, U. S. A, Vol. 1 written by W. W. Cooke and published by Forgotten Books. This book was released on 2018-02-03 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Ridgway Ornithological Club of Chicago, Illinois, U. S. A, Vol. 1: Bird Migration in the Mississippi Valley As the weather during the first six weeks of this year did not permit excur sions to new fields, I contented myself with revisiting the ground gone over in December, to see what had become of my little friends enumerated in my New Year's report. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.