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- Mohlenbrock, Robert H., 1931-15
- Audubon, John James, 1785-185113
- Geological Survey (U.S.)10
- Gould, John, 1804-18819
- Sinclair, Ian, 1948-7
- Rix, Martyn6
- Graf, Alfred Byrd5
- National Geographic Society (U.S.)5
- Porter, Eliot, 1901-19905
- Roedelberger, Franz A. (Franz Adam)5
- United States. National Aeronautics and Space Administration5
- Arlott, Norman4
- Bauer, Erich, 1953-4
- Brown, Paul Martin4
- Frankenbach, Thomas4
- Groschoff, Vera I.4
- Haas, Robert B.4
- Hargreaves, Bob4
- Hargreaves, Dorothy4
- Hayman, Peter4