Author
Darwin, Charles, 1809-1882
138
Burroughs, John, 1837-1921
109
ProQuest Ebook Subscriptions
90
ProQuest (Firm)
88
White, Gilbert, 1720-1793
82
Muir, John, 1838-1914
61
Buffon, Georges Louis Leclerc, comte de, 1707-1788
59
Jefferies, Richard, 1848-1887
57
Time-Life Books
45
Beebe, William, 1877-1962
43
Gould, Stephen Jay
40
Pliny, the Elder
40
Edward Potts Cheyney Memorial Fund
39
Smithsonian Institution
39
SpringerLink (Online service)
36
American Museum of Natural History
35
Hudson, W. H. (William Henry), 1841-1922
32
Leopold, Aldo, 1886-1948
30
Linné, Carl von, 1707-1778
30
Attenborough, David, 1926-
29
Gotham Book Mart Collection (University of Pennsylvania)
29
JSTOR
27
National Audubon Society
26
Olson, Sigurd F., 1899-1982
26
Leeuwenhoek, Antoni van, 1632-1723
25
Borland, Hal, 1900-1978
24
Teale, Edwin Way, 1899-1980
24
Early English Books Online
23
Zwinger, Ann
23
Bates, Henry Walter, 1825-1892
22
Edgar Fahs Smith Memorial Collection (University of Pennsylvania)
22
United States. National Park Service
22
British Broadcasting Corporation
21
Finch, Robert, 1943-
21
Abbott, Charles C. (Charles Conrad), 1843-1919
20
Bacon, Francis, 1561-1626
19
Bonnet, Charles, 1720-1793
19
Krutch, Joseph Wood, 1893-1970
19
Wallace, David Rains, 1945-
19
Quammen, David, 1948-
18
Sharp, Dallas Lore, 1870-1929
18
Sierra Club
18
Hooke, Robert, 1635-1703
17
Matthiessen, Peter
17
Peattie, Donald Culross, 1898-1964
17
Warner Home Video (Firm)
17
Academy of Natural Sciences of Philadelphia
16
British Broadcasting Corporation. Television Service
16
Culture Class Collection (University of Pennsylvania)
16
Durrell, Gerald, 1925-1995
16
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