The Feather Tracts of Swifts and Hummingbirds
Clark, Hubert Lyman, 1870-1947
Article
1906
The Auk
23
68--91
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/125048 DOI: https://doi.org/10.2307/4069959