"Schweiz Taufen, 1491-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FV6L-R4N : 10 February 2018), Hans Geoerg Blatner in entry for Isac, ; citing Ermatingen, Thurgau, Switzerland, reference ; FHL microfilm 958,745.
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