"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM8N-766 : accessed 20 December 2020), Katherine Galin, Precinct B Cincinnati City Ward 25, Hamilton, Ohio, United States; citing enumeration district (ED) 211, sheet 4A, family 80, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,279.
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZ2L-DVM : accessed 15 January 2016), George Gahn in entry for William Gahn and Nellie W. Marshall, 10 May 1916; citing Hamilton, Ohio, United States, reference cn 232; county courthouses, Ohio; FHL microfilm 384,150.
"United States Census, 1920", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MDPQ-63M : 11 December 2020), William J Gahn, 1920.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4W3-963 : accessed 20 December 2020), William Gahn, Cincinnati (Districts 1-250), Hamilton, Ohio, United States; citing enumeration district (ED) ED 249, sheet 14A, line 27, family 309, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1816; FHL microfilm 2,341,550.
"Ohio Deaths, 1908-1953," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZX3-2MC : accessed 15 January 2016), George Gahn in entry for William Joseph Gahn, 24 Aug 1937; citing Cincinnati, Hamilton, Ohio, reference fn 51053; FHL microfilm 2,023,534.
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