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John Wesley Powell - Wikipedia
John Wesley Powell | Explorer, Geologist, Ethnologist, Civil War …
John Wesley Powell: A Chronology | American Experience | PBS
John Wesley Powell: Explorer, Thinker, Scientist and Bureaucrat
The Visionary John Wesley Powell Had a Plan for Developing …
John Wesley Powell | U.S. Geological Survey - USGS.gov
John Wesley Powell's Undertakings | American Experience | PBS
John Wesley Powell summary | Britannica
John Wesley Powell | U.S. Geological Survey - USGS.gov
John Wesley Powell - Wikiwand