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Detailed topographical map of part of Riverside County, published by the US Geological Survey.

The map extends north to Riverside, Jurupa, La Sierra and Box Springs, and south to the Temescal area, with a large part of the map taken up by Rancho El Sobrante de San Jacinto.

The map focuses on the topography of the region, but also includes roads, railroads, rivers, towns, mountains and other early details, including the location of early structures.