"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQT9-QZ8 : 18 May 2016), Heinrich Wilhelm Anton Hirschbein in entry for Maria Louisa Hirschbein, 07 Jul 1884; Chicago, Cook, Illinois, United States, reference/certificate 60240, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm 1,287,839.
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