Knobel's 'Field Key to the Land Birds'
Knobel, Edward, 1839-1908
Article
1899
The Auk
16
367--368
BioStor
English
Washington, D.C, American Ornithologists' Union, etc, 1884-
BioStor: https://biostor.org/reference/125292 DOI: https://doi.org/10.2307/4069382
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