"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2016," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKDD-9MJR : 11 February 2018), William Rapp in entry for Mary Rapp, 15 Aug 1898; citing Birth, Mcpherson, South Dakota, United States, South Dakota Department of Health, Pierre.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMRC-27B : accessed 22 January 2019), William Rapp, Carl, Koto, Hoffman, Wachter, Wacker & Weber Township Schools, McPherson, South Dakota, United States; citing enumeration district (ED) 229, sheet 5B, family 61, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,552.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPX1-JZ3 : accessed 22 January 2019), Wm H Rapp, Carl, McPherson, South Dakota, United States; citing enumeration district (ED) ED 296, sheet 7B, family 89, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1483; FHL microfilm 1,375,496.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X36M-8S5 : accessed 22 January 2019), William H Rapp in household of Clifford R Rogers, Breckenridge, Wilkin, Minnesota, United States; citing enumeration district (ED) ED 7, sheet 20A, line 22, family 481, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1134; FHL microfilm 2,340,869.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KM9G-1K7 : 16 March 2018), William Rapp in household of John Rapp, Lidgerwood, Lidgerwood City, Richland, North Dakota, United States; citing enumeration district (ED) 39-32, sheet 4A, line 26, family 68, 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 3011.
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