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. TlMBERLINE NEAR CEDROBAMBA. Altitude about 12,.300 feet. Junction of humid Temperate and Puna Zones. Photographed by Bingham, May 11,1915.

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