An Undescribed Form of the Black Duck (Anas obscura)
Brewster, William, 1851-1919
Article
1902
The Auk
19
183--188
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/122682 DOI: https://doi.org/10.2307/4069311