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"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4G5-HQC : accessed 25 March 2016), Bart Rypstra, Muskegon, Muskegon City, Muskegon, Michigan, United States; citing enumeration district (ED) 61-45, sheet 11A, family 228, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1795.
- [S0047] Familysearch, (www.familysearch.org).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JLS9-HXS : accessed 25 March 2016), Bart Rypstra, Aug 1985; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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"Michigan Marriages, 1868-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N35M-B9V : accessed 25 March 2016), Bart Rypstra and Coba De Vries, 30 Dec 1916; citing Muskegon, Muskegon, Michigan, v 4 p 228 rn 10720, Department of Vital Records, Lansing; FHL microfilm 2,342,716.
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