[National Park Service] [Grand Canyon National Park]
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John Wesley Powell Photos

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PROF. A.H. THOMPSON, ON 2ND POWELL EXPEDITION, CHIEF GEOGRAPHER FOR U.S.GEOLOGIC SURVEY.
John Wesley Powell Photographs / # 17265
Grand Canyon National Park Museum Collection

PROF. A.H. THOMPSON, OF THE 2ND POWELL EXPEDITION, CHIEF GEOGRAPHER FOR U.S.GEOLOGIC SURVEY.
Grca 20854