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- [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.
- [S364] Iowa, County Marriages, 1838-1934.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-4QGP : 26 September 2017), Friedrich Hermann Max Berke and Johanna Strehlke, 19 Jul 1891, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,551.
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