"Illinois, Cook County Marriages, 1871-1920," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N7Z5-KT5 : accessed 23 Jul 2014), Joseph M. Hammerman and Bernice Wolf, 10 May 1917; citing Chicago, Cook, Illinois, 763243, Cook County Courthouse, Chicago; FHL microfilm 1030647.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K4MP-P9B : accessed 24 Jul 2014), Bernice Hammerman, Ward 46, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-2928, sheet 8B, family 231, NARA digital publication of T627, roll 1013.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XS5G-MZC : accessed 23 Jul 2014), Joseph Hammerman, Chicago (Districts 1751-1976), Cook, Illinois, United States; citing enumeration district (ED) 1904, sheet 27A, family 606, NARA microfilm publication T626, roll 494.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJQW-8CZ : accessed 23 Jul 2014), Joseph Hammerman, Chicago Ward 19, Cook (Chicago), Illinois, United States; citing sheet 3B, family 45, NARA microfilm publication T625, FHL microfilm 1820330.
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