"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQJ1-F7S : accessed 2 October 2018), Raymond Buckman, Bethel, Clay, South Dakota, United States; citing enumeration district (ED) ED 1, sheet 1A, line 28, family 7, 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://familysearch.org/ark:/61903/1:1:V196-PNR : 15 March 2018), Raymond Buckman, Bethel Township, Clay, South Dakota, United States; citing enumeration district (ED) 14-1, sheet 2B, line 52, family 35, 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.