| Kilder |
- [S83] Folketelling USA 01.04.1930, Census Place: Brooklyn, Kings, New York; Page: 13A; Enumeration District: 0923; FHL microfilm: 2341226 (Troverdighet: 3).
- [S414] USA registreringskort 2. verdenskrig, National Archives at St. Louis; St. Louis, Missouri; WWII Draft Registration Cards for New York City, 10/16/1940 - 03/31/1947; Record Group: Records of the Selective Service System, 147 (Troverdighet: 3).
- [S238] Find a grave, (USA), Memorial page for Earl J. Butler (unknown–13 Jan 2008), Find a Grave Memorial ID 23977009, citing George Washington Memorial Park, Paramus, Bergen County, New Jersey, USA; Maintained by Rich H. (contributor 46489213). (Troverdighet: 3).
https://www.findagrave.com/memorial/23977009/earl_j-butler
- [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).
- [S84] Family Search, (USA), "New York, New York City Marriage Records, 1829-1938", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q2CD-GDPF : 17 August 2022), Earl James Butler and Alice Anna Overeem, 1931. (Troverdighet: 3).
- [S124] Folketelling USA 01.04.1950, Enumeration District 31-2108 (Troverdighet: 3).
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