Author: Marshall, J.T., 1967.:
Title: Parallel variation in North and Middle American schreech-owls. [Mon. West. Found. Vert. Zool., 1.]
Description: Los Angeles: Western Foundation of Vertebrate Zoology. Folio, 30.3cm. Pp. [ii],72, col. photos. frontisp., many figs. and photos, 1 sketch map, refs. Orig. wrappers.

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