A Hybrid between the Cliff and Tree Swallows
Chapman, Frank M. (Frank Michler), 1864-1945
Article
1902
The Auk
19
392--394
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/123659 DOI: https://doi.org/10.2307/4069601