"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKHV-J8C : accessed 25 December 2018), Raymond Kroc in household of Louis Kroc, Oak Park, Cook, Illinois, United States; citing enumeration district (ED) ED 76, sheet 16A, family 347, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 239; FHL microfilm 1,374,252.
"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2S1-TYFP : 18 May 2016), Robert Louis Kroc, 19 Jun 1907; Chicago, Cook, Illinois, United States, reference/certificate 48209, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSTL-369 : accessed 25 December 2018), Louis Kroc, Oak Park, Cook, Illinois, United States; citing enumeration district (ED) ED 2266, sheet 13B, line 81, family 401, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 505; FHL microfilm 2,340,240.
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