Evolution of the colors of North American Land Birds Keeler, Charles, 1871-1937 creator text book San Francisco California academy of sciences 1893 1893
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ENG Animals Birds California Color Heredity Variation Q11.C18 vol.3 Occasional papers of the California Academy of Sciences, no. 3 https://www.biodiversitylibrary.org/bibliography/23864 284912 03018333 10.5962/bhl.title.23864