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

Desert prospector with two mules and a horse, Mojave Desert, 1890 

A man driving a 14-mule team hauling wagons loaded with ore from the desert mines, California, ca.1905 

View of the desert looking west from the Mojave Mining District, ca.1907 

Two men and a train of pack mules in the Mojave Desert, February, 1912 

Men standing next to a large alfalfa root in Imperial Valley, ca.1910 

Miner's pack animals in front of mining supply stores, Goldfield, Nevada, ca.1900 

Prospectors and their pack mules on the Campo trail in Devil's Canyon, 1904 

Three miners, wearing prospector outfits, standing next to a burro cart loaded with camp supplies, Goldfield, Nevada, ca.1900-1905 

A desert stage going through a canyon heading towards Goldfield, Nevada, ca.1900 

Screw poll mesquite growing in Colorado Desert, ca.1910 

Scenic view of the Mojave Desert and Providence Mountain from Bagdad Mine (the Chase Mill Site), Riverside, ca.1903 

Twenty-mule team hauling borax in wagons from mines in Death Valley, ca.1890 

Man driving an 8-mule team transporting ore in two wagons in desert community, California, ca.1890-1892 

Pack mule and man enroute to mine, Mount Lowe, California 

Salton Sea view of Superstition Mountain and Indian dwellings, ca.1900 

Woman feeding pack mules at Dove Springs on the south road to the valley, Death Valley, ca.1900-1950 

Borax Smith's 20-mule team hauling borax across the desert, Death Valley [?], ca.1890 

Man with leggings standing near a Joshua Tree (Yucca Mohaviensis) in the Mojave Desert, ca.1904 

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