"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZZ2-B5P : 16 August 2017), Mary Brown in household of Alvah Brown, Dover, Dutchess, New York, United States; citing enumeration district ED 32, sheet 68B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0824; FHL microfilm 1,254,824.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCYW-JLC : 12 April 2016), Mary E Wilcox in household of Martin Wilcox, Dover, Dutchess, New York, United States; citing family 283, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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