"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJP4-6SZ3 : 1 April 2020), John De Kriek in entry for Peter De Kriek, 22 Feb 1920; citing Iowa, United States; county district courts, Iowa; FHL microfilm 1,255,708.
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