Traction steam engine hauling borax, 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 20-mule team hauling borax across the desert, Death Valley [?], ca.1890 

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 

A traction engine hauling sugar beets, Visalia, Tulare County, California, ca.1900 

Borax Mill at Daggett, California, ca.1890 

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

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

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

Two men posing on a trolley-line engine for hauling ore cars, Grass Valley, northern California, ca.1900 

Locomotive engine used by a salt works, California, ca.1910 

View of a salt mine, California, ca.1910 

Logging train loaded with logs, ca.1900 

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

Logging train with engine capable of hauling log train up steep grades, ca.1900 

Salt stacks drying, California, ca.1910 

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

A burro-drawn wagon hauling lumber and supplies into Goldfield, Nevada, ca.1904