"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8DK-7MH : 12 April 2016), Mary Callison in household of Israel J Callison, Pocahontas county, part of, Pocahontas, Virginia, United States; citing family 510, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find A Grave, database and images (https://www.findagrave.com : accessed 07 October 2019), memorial page for Mary G Callison (19 Apr 1815–18 Feb 1905), Find A Grave: Memorial #27545096, citing Abingdon Cemetery, Abingdon, Knox County, Illinois, USA ; Maintained by cj (contributor 46953377) .
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