| Quellen |
- [S14] Fritz Krüger, Familienverhältnisse Fam.Keuchel.
- [S946] Ancestry.com, Germany and Surrounding Areas, Address Books, 1815-1974, (Name: Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2016;;), Deutsche National Bibliothek; Leipzig, Deutschland; Publisher: W. Dorn Verl.; Bestand: 1965; Signatur: ZB 17939; Laufende Nummer: 2.
- [S9535] Ancestry.com, Deutschland, Find A Grave-Index, 1600-heute, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2012;).
https://www.findagrave.com/memorial/262329138/gerhard-lagenpusch
- [S8974] Ancestry.com, Berlin, Deutschland, Heiratsregister, 1874-1936, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;), Landesarchiv Berlin; Berlin, Deutschland; Personenstandsregister Heiratsregister.
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