Mary was born about 1838. She passed away in 1879.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/117224349/mary-w-keener : accessed 10 March 2022), memorial page for Mary W Stehman Keener (11 Sep 1838–7 Feb 1879), Find a Grave Memorial ID 117224349, citing Chiques Church of the Brethren Cemetery, Manheim, Lancaster County, Pennsylvania, USA ; Maintained by Bruce Speck (contributor 46873080) .
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