"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FR-HFL : accessed 30 January 2017), Walter Barnes in household of Harry T Barnes, Ballenger, Frederick, Maryland, United States; citing enumeration district (ED) ED 81, sheet 4A, family 72, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 565; FHL microfilm 1,374,578.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QG-HQ7 : accessed 30 January 2017), Walter M Barnes in household of Harry L Barnes, Mount Pleasant, Frederick, Maryland, United States; citing ED 80, sheet 4A, line 18, family 65, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 673; FHL microfilm 1,820,673.