"Pennsylvania, Historical Society of Pennsylvania, Births and Baptisms, 1520-1999", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6CTR-F7W3 : 11 January 2021), William Fissel Ilgenfrity, 1822.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4XM-DCP : 17 October 2014), William F Ilgenfritz, Missouri, United States; citing p. 6, family 42, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,296.
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