On Buteo harlani (Aud.) and B. cooperi Cass
Ridgway, Robert, 1850-1929
Article
1885
The Auk
2
165--166
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/125028 DOI: https://doi.org/10.2307/4625218