"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWF4-5RK : 9 January 2021), Carl E Wasmer in household of William Wasmer, Oak Hill, Jefferson Township, Jackson, Ohio, United States; citing enumeration district (ED) 40-7, sheet 4B, line 72, family 85, 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 3089.