"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVPH-BT37 : 18 May 2016), Russell Frank Jonas, 08 Apr 1927; Chicago Heights, Cook, Illinois, United States, reference/certificate 108, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm 100,401,293.
"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3NX-R3G : 8 March 2018), Infant Jones, 08 Apr 1927; Public Board of Health, Archives, Springfield; FHL microfilm 1,613,731.
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