United States Census, 1900, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSQG-66L : accessed 1 April 2017), James O Learry in household of James O Learry, Precinct 19 Lake town Chicago city Ward 29, Cook, Illinois, United States; citing enumeration district (ED) 880, sheet 6A, family 83, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,280.
Illinois, Cook County Marriages, 1871-1920, database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N7C3-DYN : 26 December 2014), James O'Leary and Gertrude M. Clancy, 10 Jan 1910; citing Chicago, Cook, Illinois, 526127, Cook County Courthouse, Chicago; FHL microfilm 1,030,472.
"Illinois, Chicago, Catholic Church Records, 1833-1925", FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVMN-12PK : Mon Nov 13 21:39:57 UTC 2023), Entry for James O Leary and James O Leary, 10 Jan 1910.
Illinois, Cook County Deaths, 1878-1994, database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2MN-GBVT : 17 May 2016), James W O'Leary, 24 Jun 1976; citing Harvey, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm.
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