"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCDX-71D : 23 December 2020), Mary C Duglas in household of John Duglas, Grainger, Tennessee, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com/memorial/42888114/mary-e-greenlee : accessed 28 April 2022), memorial page for Mary E Douglas Greenlee (29 Dec 1830–7 Feb 1910), Find a Grave Memorial ID 42888114, citing Greenlee Cemetery, Grainger County, Tennessee, USA ; Maintained by PEACE & LOVE (contributor 49208454) .
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