"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KLWF-XK9 : accessed 7 March 2016), Oscar William Nelson and Louisa Iverson, 18 Aug 1926; citing , Cerro Gordo, Iowa, United States, county courthouses, Iowa.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/ML14-CLL : accessed 7 March 2016), Oscar William Nelson in household of Olof Nelson, Fairfield, Buena Vista, Iowa, United States; citing enumeration district (ED) ED 3, sheet 7A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,407.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8B3-ZML : accessed 7 March 2016), Oscar W Nelson in household of Olof Nelson, Fairfield, Buena Vista, Iowa, United States; citing sheet 7B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,480.
"Iowa Births and Christenings, 1830-1950," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XVL4-MYN : accessed 7 March 2016), Oscar W. Nelson in entry for Gracia Jean Nelson, ; citing Fairfield Twp, Buena Vista, Iowa; FHL microfilm 1,428,657.
"Iowa, County Births, 1880-1935", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KHTQ-PYK : accessed 7 March 2016), Oscar W. Nelson in entry for Carolyn Louise Nelson, 1929.
"Iowa, County Births, 1880-1935", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XV6F-ZY4 : accessed 7 March 2016), Oscar W. Nelson in entry for Gracia Jean Nelson, 1927.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KMTC-G3L : accessed 7 March 2016), Oscar W Nelson, Fairfield Township, Buena Vista, Iowa, United States; citing enumeration district (ED) 11-8, sheet 2A, family 27, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1143.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JLG9-JPV : 10 January 2021), Oscar Nelson, Nov 1982; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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