Skip to search
Skip to main content
- National Audubon Society48
- Audubon, John James, 1785-185145
- ebrary, Inc45
- Project Muse41
- Bent, Arthur Cleveland, 1866-195425
- BioOne (Organization), distributor25
- Geological Survey (U.S.)25
- Peterson, Roger Tory, 1908-199620
- Smithsonian Institution20
- Johnsgard, Paul A.19
- National Geographic Society (U.S.)17
- Chapman, Frank M. (Frank Michler), 1864-194514
- National Wildlife Federation14
- Sibley, David, 1961-12
- U.S. Fish and Wildlife Service11
- Gray, Asa, 1810-188810
- Kaufman, Kenn10
- United States National Museum10
- American Ornithologists' Union9
- Bachman, John, 1790-18749