Dudley was born about 1810.
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHYF-5TH : 16 August 2017), M D Demick, Lockport Village, Niagara, New York, United States; citing p. 91, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 311; FHL microfilm 17,199. (This one?)
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