Aythya marila or A. m. nearctica?
Bishop, Louis B. (Louis Bennett), 1865-1950
Article
1895
The Auk
12
293--295
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/124461 DOI: https://doi.org/10.2307/4068307