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{{Information |Description ={{en|1=Portrait of Almon Harris Thompson taken in 1902. }} |Source =Dellenbaugh, Frederick (1902). The Romance of the Colorado River. New York: G.P. Putnam. Available: http://archive.org/stream/romanceofcolorad00d...
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A FORMAL PORTRAIT OF PROFESSOR A.H. THOMPSON, A MEMBER OF POWELL'S SECOND EXPEDITION, AND THE CHIEF GEOGRAPHER FOR THE UNITED STATES GEOLOGIC SURVEY. CIRCA 1871.