"Pennsylvania, Historical Society of Pennsylvania, Births and Baptisms, 1520-1999", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6CTT-J3B1 : 11 January 2021), Mary Patterson Elkinton, 1857.
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MWJ7-5GL : 14 January 2022), Mary P. Elkinson in household of Jos. S. Elkinson, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district ED 90, sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
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