"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMFG-HMF : accessed 27 March 2015), Willie Mitchell in household of Wm C Mitchell, Seneca District, Campbell, Virginia, United States; citing sheet 4B, family 62, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,703.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPP6-K3Y : accessed 26 January 2016), William Mitchell Jr., Seneca, Campbell, Virginia, United States; citing enumeration district (ED) ED 29, sheet 24A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,637.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJFS-RNY : accessed 26 January 2016), William C Mitchell, Seneca, Campbell, Virginia, United States; citing sheet 2A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,884.