Stonewall, a former gold mining town in the Cuyamaca Mountains, in San Diego County, California. It was named for the Stonewall Mine, located in the vicinity and had its own post office from May 29, 1873 to August 1, 1876.
- Frickstad, Walter N., A Century of California Post Offices 1848-1954, Philatelic Research Society, Oakland, CA. 1955. pp. 147–158.
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