"Minnesota, Clay County, School Census Records, 1909-1962," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2QR-TZWQ : 11 March 2018), Robert Scheel, , Clay, Minnesota, United States; citing State School Superintendent, Clay County Auditor-Treasurer, Moorhead; FamilySearch digital folder 004339026.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KSKW-BZB : 7 January 2021), Robert Scheel in household of Fred Scheel, Moorhead, Clay, Minnesota, United States; citing enumeration district (ED) 14-30, sheet 61A, line 34, family 94, 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 1914.