"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWFF-7TS : 15 July 2017), Mary Logan, 1880; citing enumeration district ED 212, sheet 91A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 1133; FHL microfilm 1,255,133.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3SP-JC5 : accessed 22 February 2019), Mary Logan, Todd Township McConnellsburg borough, Fulton, Pennsylvania, United States; citing enumeration district (ED) 72, sheet 12A, family 253, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,412.