"Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NWY5-YZT : 24 May 2018), Joseph E. Derby and Maria Jillson, 7 Jan 1860; citing Worcester, Massachusetts, United States, State Archives, Boston; FHL microfilm 1,433,018.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NW96-XM4 : 22 May 2019), Maria E. Derby, 13 Apr 1873; citing Fitchburg, Massachusetts, v 258 p 311, State Archives, Boston; FHL microfilm 960,203.
Find A Grave, database and images (https://www.findagrave.com : accessed 24 May 2019), memorial page for Emily Maria Jillson Derby (unknown–13 Apr 1873), Find A Grave: Memorial #16770839, citing Forest Hill Cemetery, Fitchburg, Worcester County, Massachusetts, USA ; Maintained by Karen N (contributor 46862389) .
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