"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2HV3-ZFW : 6 November 2017), Joseph Barter 4th and Mary Stone, 24 Oct 1809; citing Boothbay, , Maine, United States, Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm.
"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2HKH-L4J : 4 November 2017), Joseph Barter 4th and Mary Stone, 24 Oct 1809; citing Boothbay, , Maine, United States, Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm.
"Massachusetts Deaths and Burials, 1795-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FH2N-B98 : 11 March 2018), Mary in entry for Julia Barter Allen, 05 Dec 1853; citing , reference 3960; FHL microfilm 593,719.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N4XK-WPK : 10 March 2018), Mary in entry for Benjamin Whittemore, 26 Apr 1881; citing Lancaster, Massachusetts, v 330 p 369, State Archives, Boston; FHL microfilm 960,221.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N4XF-ZLC : 10 March 2018), Mary in entry for Benjamin Whittemore, 26 Apr 1881; citing Boston, Massachusetts, v 330 p 110, State Archives, Boston; FHL microfilm 960,221.
Find A Grave, database and images (https://www.findagrave.com : accessed 04 March 2019), memorial page for Mary Whittemore (unknown–15 Aug 1828), Find A Grave: Memorial #55754843, citing Middle Cemetery, Lancaster, Worcester County, Massachusetts, USA ; Maintained by cap624 (contributor 47007905) .