Map shows early twentieth century Riverside County, California towns, roads, railroads, township grid, soil types, and the "Salton Sink." Includes legend to alkali soil content. Relief shown by hachures. Scale [1:63,360].
Map shows early twentieth century Riverside County, California towns, township grid, roads, railroads, soil types, and the "Salton Sink." Includes legends and soil profile. Relief shown by hachures. Scale [1:63,360].