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John Wesley Powell,the noted geologist who explored the Colorado River, was honored on a 6-cent stamp issued August 1, 1969. Powell led an 1869 expedition down the Green and Colorado Rivers, a 1,000-mile, four-months' journey.
John Wesley Powell
John Wesley Powell,the noted geologist who explored the Colorado River, was honored on a 6-cent stamp issued August 1, 1969. Powell led an 1869 expedition down the Green and Colorado Rivers, a 1,000-mile, four-months' journey.