"Deutschland Heiraten, 1558-1929," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VZMV-X3P : 26 December 2014), Joannis Petri Friederich in entry for Martinus Koehler and Maria Elisabetha Or Catharina Friederich, 07 Jan 1830; citing Katholisch, Herdorf, Rheinland, Prussia; FHL microfilm 565,614.
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