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- [S238] Find a grave, (USA), Memorial page for Clement Andreas Christensen (24 May 1884–24 Sep 1923), Find a Grave Memorial ID 101761799, citing Green-Wood Cemetery, Brooklyn, Kings County, New York, USA; Maintained by Athanatos (contributor 46907585). (Troverdighet: 3).
https://www.findagrave.com/memorial/101761799/clement_andreas-christensen
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- [S46] Ancestry.com, Norway, Select Marriages, 1660-1926 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Norway, Marriages, 1660-1926. Salt Lake City, Utah: FamilySearch, 2013. (Troverdighet: 3).
- [S32] Avis, The Brooklyn Eagle, Brooklyn, New York 16.05.1911 (Troverdighet: 3).
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