The following is from the 1880 voter registration for Yuba County James O Brien age 49 Native of Ireland. Occupation, miner. Local township; rose Bar. Naturalized August 18, 1866 in San Francisco 4th District Court. Date of registration; September 2, 1880 O Brien, Jr. James Age 21. Native of California. Occupation; farmer. Local township; Rose Bar. Date of registration; July 18, 1884. O Brien, Daniel William. Age 25. Native of California; occupation; farmer. Local township, Marysville. Date of registration; September 9, 1884. there is also an Edward O Brien from Canada. Age 52, occupation farmer; local township East Bear River. Naturalized March 24, 1851 in Sacramento District court. Date of registration; August 30 1880. Hope this is helpful. Rosemary