Jane Evans Best, "The Groff Book, Volume 2: A Continuing Saga", Groff History Associates, 1997, Ronks, Pennsylvania.
Find a Grave, database and images (accessed 25 June 2022), memorial page for Margaret Dodds Groff (1805–30 Sep 1859), Find A Grave: Memorial #105039197, citing Wellers Cemetery, Thurmont, Frederick County, Maryland, USA ; Maintained by Mike Hahn (contributor 46770538) .
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