"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML87-B5Q : accessed 23 January 2022), Ralph T Zook in household of Edward Zook, Walnut Creek, Holmes, Ohio, United States; citing enumeration district (ED) ED 45, sheet 7B, family 138, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1200; FHL microfilm 1,375,213.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWF3-8SQ : 9 January 2021), Ralph D Zook, Walnut Creek Township, Holmes, Ohio, United States; citing enumeration district (ED) 38-19, sheet 1B, line 41, family 11, 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 3087.
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