"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH3W-D5N : 14 December 2015), William H Davis, Oakland, Alameda, California, United States; citing sheet 2A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,090.