"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSQS-7BY : accessed 18 August 2019), Katie Hertz in household of Jacob Hertz, Precinct 24 Chicago city Ward 19, Cook, Illinois, United States; citing enumeration district (ED) 607, sheet 13A, family 208, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,269.
"Illinois, Cook County Deaths, 1878-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N7L9-S9S : 8 March 2018), Katie Hertz, 07 Jul 1920; citing , Cook, Illinois, United States, source reference 21369, record number 210, Cook County Courthouse, Chicago; FHL microfilm 1,309,239.
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