"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ1Z-4QD : accessed 30 April 2018), Edmund O Brien in household of Agnes O Brien, Manhattan Assembly District 19, New York, New York, United States; citing ED 1329, sheet 6A, line 11, family 120, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1221; FHL microfilm 1,821,221.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4L7-HY5 : accessed 30 April 2018), Edmund O Brien in household of Agnes O Brien, Manhattan (Districts 0751-1000), New York, New York, United States; citing enumeration district (ED) ED 912, sheet 10A, line 28, family 138, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1573; FHL microfilm 2,341,308.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K3YX-FVY : accessed 30 April 2018), Edmond O'Brien in household of Agnes O'Brien, Assembly District 9, Manhattan, New York City, New York, New York, United States; citing enumeration district (ED) 31-758, sheet 8A, line 16, family 166, 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 2641.
"California, County Marriages, 1850-1952," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8KT-1W4 : 8 December 2017), Edmond Joseph O'Brien and Olga Mercedes San Juan, 26 Sep 1948; citing Los Angeles, California, United States, county courthouses, California; FHL microfilm 2,116,805.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPJB-5TQ : 26 November 2014), Edmond Joseph Obrien, 08 May 1985; Department of Public Health Services, Sacramento.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JKTX-8MX : 20 May 2014), Edmond Obrien, May 1985; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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