John Wesley Powell
The Exploration of the Colorado River and Its Canyons
Report on the Lands of the Arid Region of the United States: With a More Detailed Account of the Lands of Utah
Down the Colorado: diary of the first trip through the Grand Canyon, 1869;: Photographs and epilogue, 1969
Report on the Lands of the Arid Region of the United States, With a More Detailed Account of the Lands of Utah