"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQYN-HRL : 18 May 2016), Heinrich W.A. Hirschbein in entry for Johannes Hirschbein, 24 Nov 1888; Chicago, Cook, Illinois, United States, reference/certificate 12221, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm 1,287,881.
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