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DesertUSA: John Wesley Powell
http://www.desertusa.com/magnov97/nov_pap/du_jwpowell.html
A detailed biographical overview.
John Wesley Powell
http://www.library.unt.edu/gpo/powell/powell.htm
Government reports, including scanned images from Powell's reports to Congress concerning his exploration of the West.
Major John Wesley Powell
http://www.powellmuseum.org/MajorPowell.html
Biography of the explorer of the Colorado River, from the John Wesley Powell Memorial Museum.
The American Experience: Lost in the Grand Canyon
http://www.pbs.org/wgbh/amex/canyon/
Companion site to the PBS series about Powell's Colorado River journey. With timeline, maps, and program information.
The Powell Expedition
http://www.kaibab.org/powell/powexp.htm
A map and account of the events of the Colorado River expedition.
The Story of Major John Wesley Powell
http://www.canyon-country.com/lakepowell/jwpowell.htm
A biography from Canyon Country Online.