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Author/Creator
- Adam Matthews Digital (Firm)43
- Geological Survey (U.S.)39
- Nickles, John M. (John Milton), 1859-194518
- Weeks, Fred Boughton, 1864-13
- Adam Matthew Digital (Firm)10
- Audubon, John James, 1785-18519
- Thom, Emma Mertins6
- Becker, Geoffrey S.4
- Irwin, Raymond D., 1966-4
- Library of Congress. Congressional Research Service4
- Cameron, Catherine M.3
- Darton, Nelson Horatio, 1865-19483
- Diaz, George T., 1980-3
- Foster, Stephen, 1942-3
- Karibo, Holly M.3
- Kelton, Paul3
- Martin, Philip L., 1949-3
- Messinger Carril, Olivia, 1976-3
- Partridge, Michael, 1936-3
- Pearson, T. Gilbert (Thomas Gilbert), 1873-19433