"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN7M-B31 : 8 September 2017), William F Harrison in household of Emma V Harrison, Sandy Hook, Washington, Maryland, United States; citing enumeration district ED 156, sheet 253B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0516; FHL microfilm 1,254,516.
Possibly him: "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M323-Y58 : accessed 30 December 2018), William F Harrison, Election District 1, Buckeystown (west part), Frederick, Maryland, United States; citing enumeration district (ED) 2, sheet 15B, family 271, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
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