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https://www.familysearch.org/tree/person/details/L51K-8ML
"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:QVP6-349J : 4 November 2017), W O Cook and Lucy Briggs, 03 Jul 1904; citing Oklahoma, various county courthouses, Oklahoma; FHL microfilm.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ9K-P19 : accessed 12 February 2020), Lucey Cook in household of W O Cook, Finley, Pushmataha, Oklahoma, United States; citing ED 229, sheet 11B, line 58, family , NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1480; FHL microfilm 1,821,480.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC46-SJL : accessed 12 February 2020), Lucy L Cook in household of W Obed Cook, Finley, Pushmataha, Oklahoma, United States; citing enumeration district (ED) ED 10, sheet 1B, line 75, family 15, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1929; FHL microfilm 2,341,663.