"United States Census, 1930," database with images, Family Search (https://familysearch.org/ark:/61903/1:1:H1B3-TPZ : accessed June 19, 2021), Opal L Flake in household of Otis Flake, Marshall, Harrison, Texas, United States; citing enumeration district (ED) ED 10, sheet 3A, line 35, family 61, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2354; FHL microfilm 2,342,088.
United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K47D-G6V : July 29, 2019), Opal L Flakes in household of Otis Flakes, Ward 7, Fort Worth, Justice Precinct 1, Tarrant, Texas, United States; citing enumeration district (ED) 257-32, sheet 15A, line 24, family 343, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 4185.