Local history -- Contra Costa County (Calif.).; Pittsburg (Calif.) -- History.; Historic buildings.; Black Diamond Mines Regional Preserve (Calif.).; Historic sites.;
Brown, Thomas A., 1823-1889.; Local history -- Contra Costa County (Calif.).; Land tenure -- California -- Concord -- History.; Land tenure -- California -- Pleasant Hill -- History.;
Brown, Thomas A., 1823-1889.; Local history -- Contra Costa County (Calif.).; Real property -- California -- Contra Costa County -- History.; Land tenure -- California -- Contra Costa County -- History.;