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Author/Creator
- Adam Matthew Digital (Firm), digitiser652
- U.S. Fish and Wildlife Service433
- United States310
- United States. Congress. House168
- Chapman, Frank M. (Frank Michler), 1864-1945130
- Project Muse111
- ebrary, Inc99
- Audubon, John James, 1785-185197
- National Audubon Society72
- Geological Survey (U.S.), issuing body66
- Coues, Elliott, 1842-189965
- Hudson, W. H. (William Henry), 1841-192260
- Burroughs, John, 1837-192156
- Cory, Charles B. (Charles Barney), 1857-192154
- Peterson, Roger Tory, 1908-199653
- Blanchan, Neltje, 1865-191852
- United States. Department of Agriculture52
- Smithsonian Institution. Board of Regents51
- Canadian Wildlife Service50
- Smithsonian Institution50