The distribution of bird life The distribution of bird life in the Urubamba valley of Peru; a report on the birds collected by the Yale university National geographic society's expeditions distributionofbi00chap Year: 1921 U. S. NATIONAL MUSEUM BULLETIN 117 PL. 2 Headwaters of the Urubamba River at La Raya Pass. Altitude 14,150 feet. Puna Zone. Photographed by Chapman, June 30,1916.

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