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Alkali map, California, Indio sheet.
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].
Soil map, California, Indio sheet
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].
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