Three burros used on George Wharton James' and Carl Eytel's Colorado desert trip, showing Van Buskirk ca.1900 

Photographers Dr. George Wharton James, Carl Eytel and Van Buskirk, Colorado Desert, ca.1900 

Doctor George Wharton James riding a burro on a trip to the Colorado River, ca.1900 

Carl Eytel, artist, sketching on his pad during his trip with George Wharton James to the Colorado River, ca.1900 

Carl Eytel and George Wharton James in a horse-drawn wagon on the Butterfield Stage Road in the Colorado Desert, ca.1903 

Three pack burros used in mining, California, ca.1900 

Juin, a Yuma Indian, Colorado River boatman, and interpreter, on a trip of George Wharton James on the river, ca.1900 

"The last pull on the diamond hitch" -- two men packing a burro, ca.1898 

Juin, a Yuma Indian, Colorado River boatman, and interpreter during a trip of George Wharton James on the river, ca.1900 

Desert prospector and his pack burro in the desert en route to the Peg Leg Smith Mine, Superstition Mountains, 1904 

Prospector in the desert with horse and two burros, 1880-1910 

Professor William Judson painting a picture on the bank of the Colorado River during a trip with George Wharton James, ca.1910 

A burro being packed for a desert ride, Grand Canyon, 1900 

Dr. George Wharton James with a group of Hopi Indian children and burros in the village of Shonguapavi, ca.1901-1907 

Hopi children riding burros, Arizona, ca.1900 

Dr. George Wharton James and five others pulling themselves across the Colorado Chiquito River by cable ferry, ca.1900-1903 

Hopi Indian burro standing on the rocks, Walpi, Arizona, ca.1900 

A packer on a saddle donkey leading a pack of five donkeys with a man on foot bringing up the rear, 1900 

White pack burro standing on a slope at the Grand Canyon, ca.1900 

Repacking burros after swimming across the Colorado River, Grand Canyon, ca.1900-1930