Author
U.S. Fish and Wildlife Service
639
Audubon, John James, 1785-1851
151
National Audubon Society
129
Peterson, Roger Tory, 1908-1996
114
Bent, Arthur Cleveland, 1866-1954
112
Eighteenth Century Collections Online
85
Messiaen, Olivier, 1908-1992
74
Smithsonian Institution
73
United States. Forest Service
72
ProQuest (Firm)
71
Wetmore, Alexander, 1886-1978
70
ProQuest Ebook Subscriptions
68
Chapman, Frank M. (Frank Michler), 1864-1945
66
American Ornithologists' Union
62
Hudson, W. H. (William Henry), 1841-1922
62
United States. Congress. Senate. Committee on Environment and Public Works
62
Pennsylvania Game Commission
54
Cornell University. Laboratory of Ornithology
51
Project Gutenberg
51
Coues, Elliott, 1842-1899
47
Wilson, Alexander, 1766-1813
46
Fuertes, Louis Agassiz, 1874-1927
45
Geological Survey (U.S.)
44
JSTOR
44
National Geographic Society (U.S.)
44
Burroughs, John, 1837-1921
43
Friedmann, Herbert, 1900-1987
40
Gotham Book Mart Collection (University of Pennsylvania)
39
Aristophanes
37
Bewick, Thomas, 1753-1828
37
United States. Bureau of Land Management
37
Ridgway, Robert, 1850-1929
36
Rand, Austin Loomer, 1905-1982
35
Skutch, Alexander F. (Alexander Frank), 1904-2004
34
Sutton, George Miksch, 1898-1982
34
Blanchan, Neltje, 1865-1918
33
Canadian Wildlife Service
33
Gould, John, 1804-1881
33
Sabin Americana, 1500-1926
33
Sibley, David, 1961-
33
United States. Bureau of Sport Fisheries and Wildlife
33
American Museum of Natural History
32
Olson, Storrs L.
32
Ripley, S. Dillon (Sidney Dillon), 1913-2001
32
Baird, Spencer Fullerton, 1823-1887
30
International Council for Bird Preservation
30
Academy of Natural Sciences of Philadelphia
29
Forbush, Edward Howe, 1858-1929
29
Rocky Mountain Research Station (Fort Collins, Colo.)
29
Johnsgard, Paul A.
28
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