Mary was born in 1866. She was the daughter of John Bowman and Jane Milroy. She passed away in 1947.
Sources
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M59K-DTP : accessed 16 January 2020), Mary Duncan in household of Otis Bowman, Milan, Dutchess, New York, United States; citing enumeration district (ED) ED 56, sheet 4A, family 91, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 937; FHL microfilm 1,374,950.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7C7-CD1 : accessed 16 January 2020), Mary B Duncan in household of Otis Bowman, Milan, Dutchess, New York, United States; citing enumeration district (ED) ED 32, sheet 4A, line 2, family 91, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1420; FHL microfilm 2,341,155.
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