Drennen's Mill on the Colorado River, 1900-1950 

Drennen's cabin, near his stamp mill and concentrator, on the Colorado River, 1900-1950 

Colorado River near Drennen's Mill, 1900-1950 

Concentrator mill at a mine on the Colorado River, California, ca.1900 

Group of prospectors on the Colorado River in Glen Canyon up from Lee's Ferry, Grand Canyon, ca.1900 

Amalgamator at a mine on the Colorado River, California, ca.1900 

The Colorado River in one of the Mojave canyons, California, 1900-1950 

Flat boat moored in Needles Canyon, on the Colorado River, 1900-1950 

The Colorado River entering Mojave Canyon, California, 1900-1950 

Santa Fe Bridge at Needles, over the Colorado River to Arizona, 1900-1950 

Sand bars on the Colorado River below Yuma, 1900-1950 

Great Falls on the Little Colorado River, ca.1900 

Colorado River in Glen Canyon at the head of the Grand Canyon, 1900-1930 

Soap Creek Rapids, Colorado River, Marble Canyon, ca.1900 

Colorado River, from the Hance Trail, Grand Canyon, looking east, 1900-1930 

Small ferry boats moored along the Colorado River near Giers, California, 1906 

Mule team and loaded ore wagons at stamp mill, Mojave Desert, ca.1900 

Three men and a dog in a rowboat crossing the upper Colorado River at Lee's Ferry, Grand Canyon, 1900-1930 

Bill Williams Fork of the Colorado River, 1900-1950 

Long curving jetty formed from piles on the Colorado River, New Heading, ca.1900-1950