1930 United States Federal Census, Year: 1930; Census Place: District 7, New Castle, Delaware; Roll: 287; Page: 3B; Enumeration District: 0094; FHL microfilm: 2340022, Ancestry.com Operations Inc. (2002), 1930 Census
"Delaware Vital Records, 1650-1974," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q215-RY91 : 16 April 2022), Mary Alletta Belin Dupont in entry for William Winder Laird, 1904; citing Marriage, Delaware, United States, Delaware Public Archives, Dover; FHL microfilm .
Find a Grave, database and images (https://www.findagrave.com/memorial/99332970/mary_alletta-belin-laird: accessed 03 August 2023), memorial page for Mary Alletta Belin DuPont Laird (30 Nov 1878–27 Aug 1938), Find A Grave: Memorial #99332970, citing Du Pont de Nemours Cemetery, Wilmington, New Castle County, Delaware, USA; Maintained by graversleuth (contributor 47740769).
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