Cotton close-up view, Imperial Valley, ca.1910-1925 

Wild hemp growing in Imperial Valley 

Two butterflies on alfalfa specimen in Imperial Valley, ca.1910-1925 

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

Cotton plant from Imperial, California, ca.1925 

Specimen of a date palm after irrigation in Imperial Valley, ca.1910-1920 

Mesquite tree in Imperial Valley after irrigation, ca.1910-1920 

Large cluster of dates from Imperial Valley, ca.1900-1920 

Hotel Imperial, Imperial County, ca.1910 

Russian thistle (Salsola Kali), or Ink weed, growing in the Colorado Desert, Imperial Valley, California, ca.1910 

Imperial County whirlwind on desert, ca.1910 

Close-up of a specimen of a Hydrangea in bloom, ca.1920 

Close-up of several specimens of Ramie plant in various stages of spinning, ca.1925 

Close-up of an Arizona gila monster, ca.1920 

Trees in Imperial Valley after irrigation 

Close-up of a specimen of a Lady Washington Geranium (Pelagonium), ca.1920 

Mesquite bean plant specimen, ca.1900-1910 

Primitive desert Indian meeting house, Imperial Valley, California, ca.1910 

Specimen of Kaffir corn (White Egyptian), ca.1910-1925 

Looking up the Colorado River from an island near where it enters the Imperial Canal, ca.1903