"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FP-2VZ : accessed 17 August 2017), Horace T Peters, Urbana, Frederick, Maryland, United States; citing enumeration district (ED) ED 62, sheet 7A, family 125, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 564; FHL microfilm 1,374,577.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QK-M4D : accessed 17 August 2017), Horace T Peters in household of Jemima Peters, Barnesville, Montgomery, Maryland, United States; citing ED 140, sheet 1A, line 29, family 7, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 671; FHL microfilm 1,820,671.