"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V4DV-2RB : 1 April 2020), Lucy Teune in entry for Bertus De Kriek, 25 Nov 1918; citing Allison Township, Lyon, Iowa, United States; county district courts, Iowa; FHL microfilm 1,255,708.
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