Contra Costa County (Calif.).; Local history -- Contra Costa County (Calif.).; Maps -- 1840-1850.; Mines and mineral resources -- California.;
“Mining map of California 1850, Map of the Mining District of California by Wm. A. Jackson”. The legend (“Explanation”) includes symbols for: “City or Town, Ranch, Workings for Gold, Indian Villages”. The area of the map includes a section of...