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

Twenty-mule team hauling borax out of Death Valley to the railroad, ca.1900 

Twenty-mule team hauling borax in a wagon as seen from behind, probably in Mule Canyon, ca.1890 

Sixteen-mule team hauling borax from old Borate, ca.1890-1900 

"Borax" Smith's mine at Harmony, Death Vallley, ca.1890 

Traction steam engine hauling borax, ca.1900 

Borax Smith's mine at Borate or Harmony, California, ca.1890-1900 

Borax Mill at Daggett, California, ca.1890 

Twenty-mule hitch in front of the Borax plateaus in Death Valley, ca.1900-1950 

Bennett Wells sink during the days of the twenty mule team, [s.d.] 

Traction steam engine hauling borax, ca.1900-1904 

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

Two 20-mule teams each hauling 4 ore wagons, Pinal County, Arizona, ca.1900 

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

View of the desert sands of Death Valley, ca.1900-1950 

Mojave Desert dirt road into Death Valley, ca.1900-1940 

Two men standing among rows of salt stacks in the north end of Death Valley, 1910-1920 

An aerial view of a salt marsh north of Death Valley, California, ca.1910 

View of Death Valley Road near Bennet Wells, Death Valley, California, ca.1930 

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