Junco ridgwayi in Colorado
McGregor, Richard C. (Richard Crittenden), 1871-1936
Article
1893
The Auk
10
205--206
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/122072 DOI: https://doi.org/10.2307/4068119