↑ "Maryland Probate Estate and Guardianship Files, 1796-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KX1T-7X9 : 12 March 2018), Oliver Newell Duvall, 18 Jan 1932; citing Baltimore City, county courts, Maryland.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQL-3RQ : 8 September 2017), Cordelia Dewall in household of Benjamin W Dewall, Urbana, Frederick, Maryland, United States; citing enumeration district ED 78, sheet 281C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0510; FHL microfilm 1,254,510.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M327-S2Y : accessed 14 May 2018), Cordelia D Riggs in household of George H Riggs, Election District 9, New Market (south part) New Market town, Frederick, Maryland, United States; citing enumeration district (ED) 19, sheet 9A, family 164, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FP-BDZ : accessed 14 May 2018), Cordilla D Riggs in household of Dr. George H Riggs, New Market, Frederick, Maryland, United States; citing enumeration district (ED) ED 66, sheet 15B, family 345, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 564; FHL microfilm 1,374,577.
Find A Grave, database and images (https://www.findagrave.com : accessed 13 May 2018), memorial page for Cordelia Duvall Riggs (2 Jan 1873–16 Jun 1940), Find A Grave Memorial no. 23760204, citing Mount Olivet Cemetery, Frederick, Frederick County, Maryland, USA ; Maintained by Kim K (contributor 46955000) .
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