"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MMTV-TXY : accessed 21 January 2016), Mary E Cook in household of Wilson Cook, Pleasant Valley & Terry Township, Finney, Kansas, United States; citing sheet 5A, family 82, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,480.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFX7-7TB : accessed 21 January 2016), Mary E Cook in household of Mary E Choat, Larned, Pawnee, Kansas, United States; citing sheet 4A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,544.
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