A river running west : the life of John Wesley Powell - Worster, Donald, 1941- (New York : Oxford University Press, 2001)
References : p. 611- 644
Keywords: Powell, John Wesley, -- 1834-1902; Explorers -- United States -- Biography; Conservationists -- United States -- Biography; Colorado River (Colo.-Mexico) -- Discovery and exploration; Grand Canyon (Ariz.) -- Discovery and exploration; West (U.S.) -- Discovery and exploration