From Field and Study
| Autor: | Humphrey, Philip S., Phillips, Allan R., Webster, J. Dan, Farner, Donald S., Buss, Irven O., Roest, Aryan I., Bohl, Wayne H., Stott,, Ken |
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| Zdroj: | The Condor, 1957 Mar 01. 59(2), 139-143. |
| Databáze: | JSTOR Journals |
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