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- [S0632] 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.
- [S0713] Iowa State Census, 1915.
"Iowa State Census, 1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK4Y-6KPR : 17 March 2018), Gust Berke, 1915; citing Woodbury, Iowa, United States, card no. , Iowa State Historical Department, Des Moines; FHL microfilm 1,462,967.
- [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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