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- [S1634] Massachusetts, Essex County, 1930 U.S. census, Ancestry.com, Digital images, (https://www.ancestry.com: National Archives and Records Administration, 2002), T626, roll 902, North Andover, enumeration district (ED) 223, sheet A, p. 6, dwelling 80
- [S1643] Wilkinson Birthday Book, datebook of Ruth K. (Leighton) Wilkinson and Priscilla R. (Wilkinson) Plotkin. 1920 - 1990. Privately held by Nowell-Leighton family Longmont, Colorado. 2008., Laura May Lake
- [S1634] Massachusetts, Essex County, 1930 U.S. census, Ancestry.com, Digital images, (https://www.ancestry.com: National Archives and Records Administration, 2002), T626, roll 902, North Andover, enumeration district (ED) 223, sheet A, p. 6, dwelling 80, family 115, Charles W Hinxman, accessed 25 Apr 2011
- [S1652] Massachusetts, Essex County, 1940 U.S. census, Ancestry.com, Digital images, (https://www.ancestry.com: National Archives and Records Administration, 2012), T627, roll T627_1587, North Andover, enumeration district (ED) 5-293, sheet A, p. 3, household 43, Charles W. Hinxman, accessed 22 Oct 2014
- [S1075] "Find a Grave Memorials." Database and images., (Find a Grave. https://www.findagrave.com : 2019.), (https://www.findagrave.com : accessed 27 Nov 2020); Charles William Hinxman, 1874-1961, Memorial #159446081; citing Ridgewood Cemetery, North Andover, Mass.
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