U. S. Geological Survey and others

Powell, John Wesley (1834-1902), American ethnologist, geologist, explorer, and government administrator, known for his work as the first major classifier of Native American languages, as well as for his pioneering work as a geographical and geological surveyor of the Colorado River, the Grand Canyon, and the Rocky Mountains.

From the guide to the John Wesley Powell Display Collection, 1850s to 1960s., (Cline Library. Special Collections and Archives Department.)