"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MNQK-7MT : 14 January 2022), Mary Waters in household of D. Edmond Waters, Cambridge, Dorchester, Maryland, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2F4-2H9 : accessed 29 September 2022), Mary A Waters in household of Margret A Waters, Baltimore Ward 14, Baltimore (Independent City), Maryland, United States; citing enumeration district (ED) ED 236, sheet 7A, family 122, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 557; FHL microfilm 1,374,570.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K7XC-PM1 : 8 January 2021), Mary A Waters, Baltimore, Baltimore, Maryland, United States; citing enumeration district (ED) 4-372B, sheet 3B, line 69, family 92, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1523.
Find a Grave, database and images (https://www.findagrave.com/memorial/99323855/mary-a-waters: accessed 29 September 2022), memorial page for Dr Mary A. Waters (17 Nov 1856–23 Oct 1943), Find A Grave: Memorial #99323855, citing Loudon Park Cemetery, Baltimore, Baltimore City, Maryland, USA; Maintained by Dearly Departed (contributor 47066418) .
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