| Kilder |
- [S238] Find a grave, (USA), Memorial page for John P Koehler Jr. (20 Mar 1911–10 Jun 1967), Find a Grave Memorial ID 80282812, citing Union Cemetery, Plymouth, Sheboygan County, Wisconsin, USA; Maintained by Rose Mohnsam (contributor 47105797). (Troverdighet: 3).
https://www.findagrave.com/memorial/80282812/john_p-koehler
- [S46] Ancestry.com, Milwaukee, Wisconsin, USA, vigslar, 1838–1911 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2018. (Troverdighet: 3).
- [S46] Ancestry.com, Missouri, USA, register för lutherska kyrkan, 1851-1972 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2023. (Troverdighet: 3).
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