"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MCCY-JQ8 : accessed 01 Nov 2014), Mary F Engle in household of Franklin Engle, Coyle, Jackson, Kentucky, United States; citing sheet 500C, NARA microfilm publication T9.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHGR-MYX : accessed 01 Nov 2014), Mary Hays in household of R G Hays, Berea, Madison, Kentucky, United States; citing sheet 16A, family 338, NARA microfilm publication T625, FHL microfilm 1820590.
Find a Grave, database and images (https://www.findagrave.com/memorial/8342900/mary-f-hays: accessed 05 April 2023), memorial page for Mary F. Engle Hays (7 Jun 1874–11 Apr 1964), Find a Grave Memorial ID 8342900, citing Berea Cemetery, Berea, Madison County, Kentucky, USA; Maintained by Paul McCracken (contributor 46596518).
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