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DesertUSA: John Wesley Powell
A detailed biographical overview.
John Wesley Powell
Government reports, including scanned images from Powell's reports to Congress concerning his exploration of the West.
Major John Wesley Powell
Biography of the explorer of the Colorado River, from the John Wesley Powell Memorial Museum.
The American Experience: Lost in the Grand Canyon
Companion site to the PBS series about Powell's Colorado River journey. With timeline, maps, and program information.
The Powell Expedition
A map and account of the events of the Colorado River expedition.
The Story of Major John Wesley Powell
A biography from Canyon Country Online.