"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2016," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKD8-T8G3 : 11 February 2018), Christine Anderson in entry for * Olson, 30 Jun 1906; citing Birth, Clay, South Dakota, United States, South Dakota Department of Health, Pierre.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPXV-V8D : accessed 13 April 2021), Ruth L Olson in household of Fred H Olson, Prairie Center, Clay, South Dakota, United States; citing enumeration district (ED) ED 114, sheet 11B, family 166, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1478; FHL microfilm 1,375,491.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQJ1-1NS : accessed 13 April 2021), Ruth Olson in household of Fred H Olson, Prairie Center, Clay, South Dakota, United States; citing enumeration district (ED) ED 10, sheet 6B, line 83, family 119, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2220; FHL microfilm 2,341,954.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V196-L1W : 5 January 2021), Ruth L Olson in household of Fred H Olson, Prairie Center Township, Clay, South Dakota, United States; citing enumeration district (ED) 14-10, sheet 2B, line 76, family 36, 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 3851.
Find a Grave, database and images ( : accessed 13 April 2021), memorial page for Ruth L Olson Rudd (30 Jun 1906–Jan 1994), Find A Grave: Memorial #95051133, citing Dalesburg Baptist Cemetery, Dalesburg, Clay County, South Dakota, USA ; Maintained by Grace Swanson (contributor 47658959) .
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