Author
Audubon, John James, 1785-1851
42 results
American Ornithologists' Union
23 results
National Audubon Society
21 results
Peterson, Roger Tory, 1908-1996
21 results
Bent, Arthur Cleveland, 1866-1954
19 results
Academy of Natural Sciences of Philadelphia
15 results
Johnsgard, Paul A.
11 results
U.S. Fish and Wildlife Service
10 results
Coues, Elliott, 1842-1899
9 results
Skutch, Alexander F. (Alexander Frank), 1904-2004
8 results
Baird, Spencer Fullerton, 1823-1887
7 results
Chapman, Frank M. (Frank Michler), 1864-1945
7 results
Smithsonian Institution
7 results
Cassin, John, 1813-1869
6 results
National Geographic Society (U.S.)
6 results
Howell, Steve N. G.
5 results
Pough, Richard H. (Richard Hooper), 1904-
5 results
Ridgway, Robert, 1850-1929
5 results
Brewer, Thomas Mayo, 1814-1880
4 results
Dunning, John Stewart, 1906-
4 results
Farrand, John
4 results
Fuertes, Louis Agassiz, 1874-1927
4 results
Heintzelman, Donald S.
4 results
May, John Bichard
4 results
McCarthy, Mary, 1912-1989
4 results
Nuttall, Thomas, 1786-1859
4 results
Porter, Eliot, 1901-1990
4 results
Reed, Chester A. (Chester Albert), 1876-1912
4 results
Ridgely, Robert S., 1946-
4 results
Sibley, David, 1961-
4 results
Amadon, Dean
3 results
Baicich, Paul J.
3 results
Brasher, Rex, 1869-1960
3 results
Brooks, Allan, 1869-1946
3 results
Bruun, Bertel
3 results
Cornell University. Laboratory of Ornithology
3 results
Cruickshank, Allan D.
3 results
Dunne, Pete, 1951-
3 results
Elliot, Daniel Giraud, 1835-1915
3 results
Forbush, Edward Howe, 1858-1929
3 results
Harrison, Colin James Oliver
3 results
Jaques, Francis Lee, 1887-1969
3 results
Kortright, Francis H.
3 results
Meyer de Schauensee, Rodolphe, 1901-1984
3 results
Murphy, Robert Cushman, 1887-1973
3 results
National Wildlife Federation
3 results
Pearson, T. Gilbert (Thomas Gilbert), 1873-1943
3 results
Peterson, Virginia Marie, 1925-
3 results
Pettingill, Olin Sewall, 1907-2001
3 results
Point Reyes Bird Observatory
3 results
more…