Margaret was born in 1874. She passed away in 1941.
Sources
Find A Grave, database and images (https://www.findagrave.com : accessed 23 August 2019), memorial page for Margaret “Mattie” Mixson Koch (1874–1 Sep 1941), Find A Grave: Memorial #121026056, citing Quanah Memorial Park, Quanah, Hardeman County, Texas, USA ; Maintained by Jeanette Perrin Coaly (contributor 47499981).
Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K394-3L4 : 13 March 2018), Margaret Mixson Kach, 01 Sep 1941; citing certificate number 40770, State Registrar Office, Austin; FHL microfilm 2,138,745.
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