"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M33B-VHQ : accessed 22 July 2018), James Brun in household of M F Brun, Avoca borough Ward 1, 3, Luzerne, Pennsylvania, United States; citing enumeration district (ED) 33, sheet 10A, family 182, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,430.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG8J-55N : accessed 22 July 2018), James O Brien in household of Michael O Brien, Avoca Ward 3, Luzerne, Pennsylvania, United States; citing enumeration district (ED) ED 5, sheet 2A, family 28, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1365; FHL microfilm 1,375,378.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFT9-JRS : accessed 22 July 2018), James O Brien in household of Michael O Brien, Avoca Ward 3, Luzerne, Pennsylvania, United States; citing ED 8, sheet 19A, line 43, family 244, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1591; FHL microfilm 1,821,591.
"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KHFP-FWM : 23 September 2017), James B O'Brien and Margaret C Quinn, 1921.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHQP-T31 : accessed 22 July 2018), James O'Brien, Avoca, Luzerne, Pennsylvania, United States; citing enumeration district (ED) ED 5, sheet 7B, line 94, family 159, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2066; FHL microfilm 2,341,800.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ77-9NJ : accessed 22 July 2018), James B O'Brien, Ward 2, Avoca, Avoca Borough, Luzerne, Pennsylvania, United States; citing enumeration district (ED) 40-7, sheet 13B, line 61, family 250, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3549.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VQFH-FZ9 : 9 March 2018), James Brennan O'Brien, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J2QP-JM5 : 20 May 2014), James Obrien, Mar 1978; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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