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- [S238] Find a grave, (USA), https://www.findagrave.com/memorial/175945060/william-francis-campbell (Troverdighet: 3).
Accessed 07 December 2023, memorial page for William Francis Campbell (1 Jan 1867– 19 Feb 1921), Find a Grave Memorial ID 175945060, citing The Evergreens Cemetery, Brooklyn, Kings County, New York, USA; Maintained by AnonymousLMB (contributor 48290351).
- [S83] Folketelling USA 01.04.1930, Census Place: Brooklyn, Kings, New York; Page: 23B; Enumeration District: 1025; FHL microfilm: 2341240 (Troverdighet: 3).
- [S238] Find a grave, (USA), https://www.findagrave.com/memorial/118224718/barbara-campbell (Troverdighet: 3).
Accessed 07 December 2023, memorial page for Barbara O'Brien Campbell (Sep 1867– 4 Jan 1933), Find a Grave Memorial ID 118224718, citing The Evergreens Cemetery, Brooklyn, Kings County, New York, USA; Maintained by Athanatos (contributor 46907585).
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