"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKX9-NY4 : accessed 15 January 2020), Ethel Hulin in household of Nels Hulin, Peoria Ward 2, Peoria, Illinois, United States; citing enumeration district (ED) ED 72, sheet 1B, family 17, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 316; FHL microfilm 1,374,329.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJC7-QCK : accessed 15 January 2020), Ethel Hulin in household of Nels Hulin, Peoria Ward 2, Peoria, Illinois, United States; citing ED 76, sheet 7A, line 9, family 156, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 400; FHL microfilm 1,820,400.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XS1L-F1C : accessed 15 January 2020), Ethel R Gebhards in household of Nels Hulin, Peoria, Peoria, Illinois, United States; citing enumeration district (ED) ED 61, sheet 22A, line 32, family 507, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 549; FHL microfilm 2,340,284.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWTF-4LX : 21 December 2019), Ethel Gebhards in household of Nels Hulin, Ward 5, Peoria, Peoria City Township, Peoria, Illinois, United States; citing enumeration district (ED) 104-54, sheet 2B, line 78, family 47, 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 918.