Catalogue of Birds of the Americas and the Adjacent Islands
By Charles E. Hellmayr and Boardman Conover. Part 1, No. 4: Cathartidæ—Accipitridæ—Pandionidæ—Falconidæ. (Zoological Series, Vol. 13, Publication 634.) Pp. vi + 358. (Chicago: Field Museum of Natural History, 1949.) 4 dollars.
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American Birds of Prey. Nature 165, 827 (1950). https://doi.org/10.1038/165827a0
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DOI: https://doi.org/10.1038/165827a0