"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSG6-8B1 : accessed 12 Jul 2014), Mary E Dungan in household of David L Dungan, Hornellville Township (excl Hornellville city), Steuben, New York, United States; citing sheet 4B, family 95, NARA microfilm publication T623, FHL microfilm 1241164.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M54Q-XV5 : accessed 12 Jul 2014), Mary E Dungan in household of David L Dungan, Dansville, Steuben, New York, United States; citing enumeration district (ED) 126, sheet 13A, family 319, NARA microfilm publication T624, FHL microfilm 1375093.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MVSJ-XVK : accessed 12 Jul 2014), Mary E Dungan in household of David L Dungan, Dansville, Steuben, New York, United States; citing sheet 2A, family 34, NARA microfilm publication T625, FHL microfilm 1821267.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X7CK-2LK : accessed 12 Jul 2014), Mary Dungan in household of David L Dungan, Buffalo (Districts 1-250), Erie, New York, United States; citing enumeration district (ED) 0151, sheet 6B, family 150, NARA microfilm publication T626, roll 1427.
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