| Quellen |
- [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.
- [S364] Iowa, County Marriages, 1838-1934.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-TKVR : 4 November 2017), Gus Berke in entry for Harry P Kennedy and Freda Berke, 02 Jul 1921, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,553.
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