↑ "California Death Index, 1905-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKS9-CM8N : 8 November 2017), John McMahon, 1937; citing 29925, Department of Health Services, Vital Statistics Department, Sacramento; FHL microfilm 1,686,049.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMVP-G4P : accessed 22 November 2019), John Mc Mahon in household of Mary Mccurdy, Milwaukee city Ward 12, Precinct 5, Milwaukee, Wisconsin, United States; citing enumeration district (ED) 105, sheet 16A, family 315, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,803.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP2M-PRR : accessed 22 November 2019), John Mc Mahon, Milwaukee Ward 17, Milwaukee, Wisconsin, United States; citing enumeration district (ED) ED 182, sheet 9A, family 176, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1722; FHL microfilm 1,375,735.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K87S-ZL2 : 24 August 2019), John Arthur McMahon, 1917-1918.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFK2-46M : accessed 22 November 2019), John A McMahon, Milwaukee Ward 17, Milwaukee, Wisconsin, United States; citing ED 194, sheet 12B, line 80, family , NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 2002; FHL microfilm 1,822,002.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC6N-LP1 : accessed 22 November 2019), John A Mc Mahon, San Diego, San Diego, California, United States; citing enumeration district (ED) ED 76, sheet 11A, line 45, family 348, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 191; FHL microfilm 2,339,926.
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