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1861, Proceedings of the Zoological Society of London, Volume 1, 127-130.
Book
2017, ISBN 0062446819, 352 pages
A comlete guide to every warbler, along with all the other songbirds you will find in North America. 
Songbirds | Wood warblers
Book
1994, The Nature of Things., 1 videocassette (47 min, )
In the north, songbirds are welcome harbingers of spring but every year there are fewer voices. There may be as many as five billion fewer songbirds now than... 
Songbirds | Songbird migration
Book
1998, General technical report (Rocky Mountain Research Station (Fort Collins, Colo.)), Volume RMRS-GTR-1., 23
Book
1997, General technical report (Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)), Volume RM-GTR-292., iv, 152
Book
1978, The New naturalist, ISBN 9780002196703, Volume 63, 304 p., 24 p. of plates
Book
1965, Publications of the Museum, Michigan State University. Biological series, Volume 3, no. 1, [1]-47
Book
1914, Smithsonian miscellaneous collections, Volume 2260., 6
Book
1856, Cheap edition for the million, Treatises on song-birds, viii, 26, 26, 28, 34, 36, 32, 48, 8
Book
Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, 06/2019, Volume 116, Issue 24, pp. 11570 - 11572
Journal Article
Proceedings of the Royal Society B: Biological Sciences, ISSN 0962-8452, 05/2017, Volume 284, Issue 1854, pp. 20170469 - 20170469
Journal Article
Journal Article
ELIFE, ISSN 2050-084X, 10/2015, Volume 4
Journal Article
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