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- [S183] 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.
- [S198] 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.
- [S112] United States Census, 1930.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMKJ-713 : accessed 28 March 2018), Gust Berke, Sioux City, Woodbury, Iowa, United States; citing enumeration district (ED) ED 59, sheet 15A, line 33, family 346, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 690; FHL microfilm 2,340,425.
- [S364] Iowa, County Marriages, 1838-1934.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-4Q2J : 26 September 2017), Gustav Berke and Auguste Strehlke, 26 Apr 1891, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,551.
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