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- [S194] Iowa, County Births, 1880-1935.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVF8-5P8 : 10 March 2018), Emil Otto Max Berke, 27 Mar 1903; citing Sioux City, Woodbury, Iowa, United States; county district courts, Iowa; FHL microfilm 1,451,574.
- [S183] United States Census, 1920.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD93-VQY : accessed 27 March 2018), Max Berke, Sioux City Precinct 15, Woodbury, Iowa, United States; citing ED 236, sheet 9B, line 90, family 233, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 521; FHL microfilm 1,820,521.
- [S196] California, County Marriages, 1850-1952.
- [S364] Iowa, County Marriages, 1838-1934.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-Y4MV : 4 November 2017), Emil Otto Max Berke and Olive Evalyn Mitchell, 01 Jul 1922, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,554.
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