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- [S139] Folketelling USA 15.04.1910, Census Place: Bronx Assembly District 34, New York, New York; Roll: T624_1001; Page: 4A; Enumeration District: 1566; FHL microfilm: 1375014 (Troverdighet: 3).
- [S46] Ancestry.com, New York City Department of Records & Information Services; New York City, New York; New York City Birth Certificates; Borough: Bronx; Year: 1908 (Troverdighet: 3).
- [S32] Avis, The Baltimore Sun Baltimore, Maryland · Wednesday, April 27, 1977 (Troverdighet: 3).
- [S238] Find a grave, (USA), https://www.findagrave.com/memorial/241109342/raymond-ludwigson (Troverdighet: 3).
Accessed 20 January 2024, memorial page for Raymond Ludwigson (1908– Apr 1977), Find a Grave Memorial ID 241109342, citing Bel Air Memorial Gardens, Bel Air, Harford County, Maryland, USA; Maintained by Victoria Merryman-Robbins (contributor 47372310).
- [S156] Sagene ministerialbok 02 1880 - 1897. Sagene menighet, Oslo, I Ægteskab Indtraadte 1897. Side 183 - nr. 22. Jørgen Ludvigsen og Ragna Emilie Nilsen. (Troverdighet: 3).
- [S47] Folketelling Norge 03.12.1900, 0301 Kristiania kjøpstad (Troverdighet: 3).
https://www.digitalarkivet.no/pf01037045215521
- [S139] Folketelling USA 15.04.1910, Bronx Assembly District 34, New York, New York; Rulle: T624_1001; Sida: 4a; Räkningsdistrikt:: 1566; FHL-mikrofilm: 1375014 (Troverdighet: 3).
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