"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3ZC-K4P : accessed 23 July 2021), Adda B Allen in household of Sion B Allen, Twin Groves Township (part of) Carl Junction city, Jasper, Missouri, United States; citing enumeration district (ED) 69, sheet 7A, family 133, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,867.