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- [S0710] Iowa, County Births, 1880-1935.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVF4-Q1Q : 10 March 2018), Gustav Berke in entry for Frances Helen Berke, 01 Mar 1912; citing Sioux City, Woodbury, Iowa, United States; county district courts, Iowa; FHL microfilm 1,451,575.
- [S0699] United States Census, 1920.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD9S-FZJ : accessed 28 March 2018), Gust Berke, Sioux City Precinct 11, Woodbury, Iowa, United States; citing ED 227, sheet 7A, line 24, family 134, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 520; FHL microfilm 1,820,520.
- [S0714] Iowa State Census, 1925.
"Iowa State Census, 1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKQ4-8P6L : 16 March 2018), Gus Berke, Sloan, Woodbury, Iowa, United States; citing Iowa State Historical Department, Des Moines; FHL microfilm 1,429,617.
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