| Sources |
- [S64] Missouri Bureau of Vital Records, Missouri Secretary of State, Missouri -- Death Certificates 1910-1974, (https://s1.sos.mo.gov/Records/Archives/ArchivesMvc/ :n.d.), death certificate no. 60-041118 (1960), George E. Karl, accessed 10 February 2016. (Reliability: 2).
- [S30] Missouri., Missouri, Buchanan County -- The St. Joseph News-Press NOW Newspaper (Online), (http://newspressnow.com:), "Clifton E. Karl 1930-2011," 14 March 2011, online archives (http://www.newspressnow.com/obituaries/article_3183eec4-39e5-5f91-9e57-5f79b968669c.html : accessed 10 February 2016). (Reliability: 2).
- [S30] Missouri., Missouri, Buchanan County -- The St. Joseph News-Press NOW Newspaper (Online), (http://newspressnow.com:), "Karl, Alfred J. 1926-2017," 4 June 2017, online archives (http://www.newspressnow.com/obituaries/karl-alfred-j/article_eed356a9-45b6-5401-9712-fb4d91e0b7c2.html : accessed 23 June 2018). (Reliability: 2).
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