"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLJS-7SB : accessed 17 July 2022), Mildrid Spain in household of Jess Spain, Marysville Ward 3, Union, Ohio, United States; citing enumeration district (ED) ED 165, sheet 2A, family 37, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1238; FHL microfilm 1,375,251.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X4ZK-NT1 : accessed 18 February 2023), Mildred J Spain in household of Jess L Spain, Marysville, Union, Ohio, United States; citing enumeration district (ED) ED 16, sheet 6A, line 30, family 162, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1886; FHL microfilm 2,341,620.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWG8-37S : 9 January 2021), Mildred Daniels in household of Howard Daniels, Marysville, Paris Township, Union, Ohio, United States; citing enumeration district (ED) 80-15, sheet 4B, line 71, family 100, 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 3162.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V3MW-YYZ : 9 January 2021), Mildred J Baker, 17 Apr 2002; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find a Grave, database and images (https://www.findagrave.com/memorial/155627411/mildred-jeanette-opphile: accessed 17 February 2023), memorial page for Mildred Jeanette Spain Opphile (17 Sep 1907–17 Apr 2002), Find a Grave Memorial ID 155627411, citing Oakdale Cemetery, Marysville, Union County, Ohio, USA; Maintained by Debbie (contributor 46911311).
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