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 Chauillay Bridge Over the Urubamba River. Altitude 3,700 feet. Arid Tropical Zone. Photographed by Chapman, July 9, 1916. Santa Ana Valley, Lower Urubamba Valley. Utitude 3,500feet. Arid Tropica] Zone. Photographed by Chapman. Jr., July 16,1916.

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