"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJF4-HKX : 10 February 2018), Albert Fredrick and Nellie May Knox, 10 May 1886, , Audubon, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,035,101.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9V1-2WP : accessed 11 December 2020), Nellie M Frederick in household of Albert Frederick, Greeley Township, Audubon, Iowa, United States; citing enumeration district (ED) 25, sheet 7A, family 116, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,416.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML19-96X : accessed 11 December 2020), Nellie M Fredricks in household of Albert Fredricks, Greeley, Audubon, Iowa, United States; citing enumeration district (ED) ED 22, sheet 7A, family 133, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 391; FHL microfilm 1,374,404.
"United States Census, 1920," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M8Y5-ZKQ : accessed 11 December 2020), Nellie M Fredricks in household of Albert Fredricks, Audubon, Iowa, United States; citing ED 22, sheet 3B, line 90, family 86, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 476; FHL microfilm 1,820,476.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XMN7-PX6 : accessed 11 December 2020), Nellie M Fredricks, Exira, Audubon, Iowa, United States; citing enumeration district (ED) ED 5, sheet 5A, line 35, family 123, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 640; FHL microfilm 2,340,375.
Find A Grave: Memorial #112310242. Find a Grave, database and images (https://www.findagrave.com : accessed 11 December 2020), memorial page for Nellie Mae Knox Frederick (4 May 1867–26 May 1950), Find a Grave Memorial no. 112310242, citing Exira Cemetery, Exira, Audubon County, Iowa, USA ; Maintained by Cyndi Ingle (contributor 48850210) | Headstone image.
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