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- [S139] Folketelling USA 15.04.1910, Census Place: Oyster Bay, Nassau, New York; Roll: T624_995; Page: 15A; Enumeration District: 1143; FHL microfilm: 1375008 (Troverdighet: 3).
- [S46] Ancestry.com, U.S., Evangelical Lutheran Church in America Church Records, 1781-1969 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2015. (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Henry Parker Christensen (28 Jan 1910–27 Dec 1998), Find a Grave Memorial ID 71287281, citing Green Hills Memorial Park, Rancho Palos Verdes, Los Angeles County, California, USA; Maintained by GreenHills Stones Calling (contributor 47882 (Troverdighet: 3).
https://www.findagrave.com/memorial/71287281/henry_parker-christensen
- [S46] Ancestry.com, New York, New York, U.S., Extracted Marriage Index, 1866-1937 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. (Troverdighet: 3).
- [S82] Folketelling USA 05.01.1920, Census Place: Los Angeles Assembly District 63, Los Angeles, California; Roll: T625_107; Page: 17B; Enumeration District: 188 (Troverdighet: 3).
- [S241] Folketelling USA 01.04.1940, Census Place: Los Angeles, Los Angeles, California; Roll: m-t0627-00383; Page: 10A; Enumeration District: 60-428 (Troverdighet: 3).
- [S46] Ancestry.com, California, U.S., County Birth, Marriage, and Death Records, 1849-1980 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2017. (Troverdighet: 3).
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