Author: RIDGWAY, Robert, 1875.:
Title: Outlines of a natural arrangement of the Falconidae.
Description: Bull. U.S. Geol. Geogr. Surv. Territ., Ser. 2, No. 4: pp. 225-231,[17], 44 drawings on 8 lithogr. pls. Orig. printed wrs. of journal issue. Waterstain on part of front cover, spine neatly mended with matching paper, contents good.

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