The 6-cent stamp honoring John Wesley Powell (1834-1902), the noted geologist who explored the Colorado River, was issued August 1, 1969, at Page, Arizona, near the lake that bears his name.
In 1869 Powell led an expedition down the Green and Colorado Rivers, a perilous 1,000-mile, four-months' journey. Major Powell returned to civilization and fame. His career expanded, and he is now regarded as the father of the US Geological Survey, the Reclamation Service of the Interior Department, and the Bureau of American Ethnology of the Smithsonian Institution.
The stamp design was by Rudolph Wendelin of the Department of Agriculture's Forest Service. The initial printing order of 120 million stamps in panes of fifty was authorized. The stamp was lithographed and engraved (Giori).
Postal Bulletin (July , 1969).