Identified in caption as Johnny Sommerville, 'a buckaroo'. Ethnicity is a little hard to determine from this picture, most likely Native American, possibly even African American
Group with truck (probably a GMC) loading or unloading for a picnic. People not identified, probably Mrs. Woodhouse at far right, maybe Katharine Baily (her family was located at the salt works) or Mrs. Cadman standing next to rear wheel of truck.
A four-horse team pulls a scraper, guided by three unidentified students, possibly including Julian Steward DS18 (center). Side view of a nice-looking team.
Teams of four horses (left), two horses (center) and two mules (right) begin to dig the lower reservoir, pulling the bucket scrapers known as "Fresnos". A very fine pair of mules on the right.
Katherine Baily was the daughter of workers at the salt works at Deep Springs Lake, and socialized with the Deep Springs community. In these photos she is pointing a shotgun and (it seems, if oddly) washing a roll of developed film
A team of horses begins digging the lower reservoir, guided by three unidentified people. The handle extending above the left-hand person's head was a lever to control the depth of cut, and could require (and deliver) considerable force.