Teams of horses preparing farm land next to a river in Mexico south of Calexico, ca.1910

Photograph of teams of horses preparing farm land next to a river in Mexico south of Calexico, ca.1910. At center, a team of horses pull a plow across the edge of the river at right, walking towards the viewer. At right, a lone man on a horse stands on the bridge across the river. At left, a second team of horses is tended to by two men. An earlier version of the record reads: "300,000 acres in Mexico could be cultivated tributary to Calexico in the Imperial Valley".