"Deutschland Geburten und Taufen, 1558-1898," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NG83-GG3 : 10 February 2018), Theresia Huth in entry for Gertrud Maus, 16 Jun 1874; citing Delhoven, Rheinland, Preußen, Germany; FHL microfilm 939,289.