↑ Seventh Census of the United States, 1850; (National Archives Microfilm Publication M432, 1009 rolls); Year: 1850; Census Place: Steubenville, Jefferson, Ohio; Roll: M432_699; Page: 23B; Image: 355 : Thomas Johnson
↑ 1860 U.S. census, population schedule. NARA microfilm publication M653, 1,438 rolls.; Year: 1860; Census Place: Steubenville, Jefferson, Ohio; Roll: M653_993; Page: 260; Family History Library Film: 803993 : Thomas Johnson
Find A Grave, database and images (https://www.findagrave.com : accessed 27 April 2018), memorial page for Thomas Johnson, MD (21 May 1811–19 Jun 1879), Find A Grave: Memorial #146953716, citing Union Cemetery, Steubenville, Jefferson County, Ohio, USA ; Maintained by Mary Ann (contributor 47479459) .
The Sherrard Family of Steubenville by Robert Andrew Sherrard, James B. Rodgers Printing Company, Philadelphia, PA, 1890,
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