"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPV4-WCB : accessed 25 January 2021), Donald M Gapin in household of Jess Gapin, Monroe Ward 4, Green, Wisconsin, United States; citing enumeration district (ED) ED 11, sheet 14A, family 30, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1704; FHL microfilm 1,375,717.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JL3P-DM9 : accessed 18 May 2016), Robert D Gapen, 18 Dec 1998; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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