(Research):"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QG-PS1 : accessed 15 September 2020), Mary Cline in household of George Cline, Ballenger, Frederick, Maryland, United States; citing ED 91, sheet 3B, line 84, family 46, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 673; FHL microfilm 1,820,673.