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- [S194] Iowa, County Births, 1880-1935.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVFD-49T : 10 March 2018), Max Berke in entry for Alfred G Berke, 14 Dec 1898; citing Sioux City, Woodbury, Iowa, United States; county district courts, Iowa; FHL microfilm 1,451,574.
- [S195] Iowa, Delayed Birth Records, 1850-1939.
"Iowa, Delayed Birth Records, 1850-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q246-N2V4 : accessed 28 March 2018), Max Berke in entry for Alfred G Berke, 14 Dec 1898, Sioux City, Woodbury, Iowa, United States; citing reference ID 278443, State Historical Society of Iowa, Des Moines; FamilySearch digital folder 101715023.
- [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.
- [S51] United States Census, 1940.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KM1D-77Q : accessed 28 March 2018), Alfred G Berke, Area C, Sioux City, Sioux City, Woodbury, Iowa, United States; citing enumeration district (ED) 97-89, sheet 7A, line 16, family 138, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1216.
- [S193] California Death Index, 1940-1997.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP8J-HYB : 26 November 2014), Alfred Gustav Berke, 27 Jun 1982; Department of Public Health Services, Sacramento.
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