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- [S194] Iowa, County Births, 1880-1935.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVFL-N87 : 10 March 2018), Gustav Berke in entry for Rudolph Arthur Berke, 03 Jan 1898; citing Sioux City, Page, Iowa, United States; county district courts, Iowa; FHL microfilm 1,451,574.
- [S364] Iowa, County Marriages, 1838-1934.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-Z6HR : 27 September 2017), Gust Berke in entry for Rudolph Berke and Elsie Bean, 23 Feb 1918, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,902.
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