"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9SJ-2ZB : accessed 28 May 2018), Ludwig J Mortensen in household of Bickitm Mortensen, Election District 7 Minneapolis city Ward 8, Hennepin, Minnesota, United States; citing enumeration district (ED) 87, sheet 12A, family 234, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,768.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHSM-8M8 : accessed 28 May 2018), Ludwig C Mortensen, West Fairview, Cumberland, Pennsylvania, United States; citing enumeration district (ED) ED 52, sheet 1A, line 31, family 8, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2025; FHL microfilm 2,341,759.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQX6-X8J : accessed 28 May 2018), Ludwig C Mortensen, Cumberland Township, Adams, Pennsylvania, United States; citing enumeration district (ED) 1-9, sheet 13B, line 70, family 189, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3395.
"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VFWZ-4VD : 4 November 2017), Ludwig Christian Mortensen and Ruth Anna Meales, 1923.
Find A Grave, database and images (https://www.findagrave.com : accessed 28 May 2018), memorial page for PVT Ludwig Christian Mortensen (30 Jan 1883–13 Jul 1968), Find A Grave Memorial no. 54760933, citing Gettysburg National Cemetery, Gettysburg, Adams County, Pennsylvania, USA ; Maintained by Karl Stelly (contributor 47103588) .
"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VF9B-BG7 : 5 November 2017), Ludwig C. Mortensen in entry for John Meales Mortensen and Kathleen Marie Zeigler, 1948.
"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VF9B-17Y : 5 November 2017), Ludwig C. Mortensen in entry for Herbert Thomas Carr and France Ann Mortensen, 1949.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK5R-6FGC : accessed 28 May 2018), Ludwig C Mortensen in entry for Mrs Camilla R Crone, Columbia, South Carolina, United States, 16 Feb 2005; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing State, The, born-digital text.
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