He died in 1948 and was buried at Little Lake Cemetery, Peterborough.
Sources
"Ontario Births, 1869-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMQR-3Z7 : 16 July 2017), Mossom Martin Boyd in entry for Mossom Degrassi Boyd, 16 Jul 1884; citing Birth, Bobcaygeon, Victoria, Ontario, Canada, citing Archives of Ontario, Toronto; FHL microfilm 1,845,871.
Find a Grave, database and images (https://www.findagrave.com : accessed 06 April 2021), memorial page for Mossom DeGrassi Boyd (1884–1948), Find A Grave: Memorial #177475701, citing Little Lake Cemetery, Peterborough, Peterborough County, Ontario, Canada ; Maintained by bblakel (contributor 48212523) .
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