" Dr. Rock and his Chinese assistants collected over 1000 birds, which after passing through many delays, and Chinese civil wars, reached this country in perfect condition without the loss of a feather"
Outram Bangs and James L. Peters
"Birds Collected by Dr. Joseph F. Rock in Western Kansu and Eastern Tibet"
Bulletin of the Museum of of Comparitive Zoology. Vol 68, No. 7, 1928
Photograph by J. F. Rock
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