"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJMP-YJ1 : accessed 27 August 2018), Gerald E T Cronk in household of Fred Y Cronk, Tulsa, Tulsa, Oklahoma, United States; citing ED 239, sheet 7A, line 50, family 155, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1487; FHL microfilm 1,821,487.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC4L-6T5 : accessed 27 August 2018), Gerald Cronk in household of Fred Y Cronk, Lynn Lane, Tulsa, Oklahoma, United States; citing enumeration district (ED) ED 22, sheet 13B, line 64, family 306, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1933; FHL microfilm 2,341,667.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VB23-RB3 : accessed 27 August 2018), Jerry Cronk in household of Fred Y Cronk, Lynn Lane Township, Tulsa, Oklahoma, United States; citing enumeration district (ED) 72-27, sheet 18B, line 70, family 390, 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 3336.
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