Source : Smithsonian Institution, John Wesley Powell, Almon Harris Thompson, Elliott Coues, George Brown Goode (1875). “Exploration of the Colorado River of the West and Its Tributaries: Explored in 1869, 1870, 1871, and 1872, Under the Direction of the Secretary of the Smithsonian Institution”, p.55
John Wesley Powell#Rocks Quotes #Rivers Quotes #Landscape Quotes
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