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

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

Drennen's Mill -- stamp mill and concentrator -- on the Colorado River, 1900-1950 

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

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

Yuma Indian dwellings near the Colorado River on the Yuma Indian reservation, ca.1900 

Near the junction of the Havasu and Colorado Rivers, Grand Canyon, 1900-1930 

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

Bill Williams Fork of the Colorado River, 1900-1950 

A small ferry boat moored along the Colorado River in one of the Mojave canyons, California, 1900-1950 

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

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

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

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

Men and horses work on the levee on the south bank of the Canal near the Colorado River, ca.1903 

Colorado River from the foot of Bright Angel Trail, Grand Canyon, looking east, 1900-1930 

Looking east from the Bright Angel Trail near the Colorado River, Grand Canyon, ca.1900-1930 

View of the Colorado River near its junction with the Havasu River, Grand Canyon, 1900-1930 

Mesquite forest near the Colorado River, California, ca.1910-1920 

Bass Ferry crossing the Colorado River from the north side, Mystic Springs Trail, Grand Canyon, ca.1900-1930