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  • All fields: (“Explanation”)
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    • Mining map [cartographic material].

    • 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...

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