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Interesting large format topographical map centered on the Santaa Ana River, published by the United States Geological Survey.

The map extends from Santa Ana to Aliso Point, showing a number of Ranchos, including Santiago de Santa Ana, Loma de Santiago, and Las Bolsas. Includes early railroad lines, topogrphical details, towns, rivers, etc. One of the earliest detailed and reasonably obtainable maps of the region.