"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLQ8-M3S : accessed 30 July 2022), Letha M Mccully in household of Marshall Mccully, Aline, Alfalfa, Oklahoma, United States; citing enumeration district (ED) ED 1, sheet 8A, family 83, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1242; FHL microfilm 1,375,255.
"Oklahoma, School Records, 1895-1936," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:78QW-9VPZ : 19 October 2019), Letha McCully, 1915; citing School Enrollment, Aline, Alfalfa, Oklahoma, United States, multiple County Clerk offices, Oklahoma school district offices, Oklahoma; FHL microfilm .
"Oklahoma, County Marriages, 1890-1995." Database with images. FamilySearch. "Oklahoma, County Marriages, 1890-1995," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVKF-FZZ : 23 February 2021), Carl Henry Clawson and Letha Minnie Mccully, 15 Jun 1920; citing Oklahoma, various county courthouses, Oklahoma; FHL microfilm.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XQKJ-2P3 : accessed 30 July 2022), Lettia M Clawson in household of Carl H Clawson, Beaver, Furnas, Nebraska, United States; citing enumeration district (ED) ED 3, sheet 10A, line 2, family 243, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1280; FHL microfilm 2,341,015.