"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCYT-3S1 : 23 December 2020), Mary Blackwell in household of Jacob Blackwell, Williamsburg, Kings, New York, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6W3-KS2 : 3 March 2021), Mary Blackwell in household of Jacob Blackwell, E.D. 1, Ward 13, Brooklyn City, Kings, New York, United States; citing p. , line #20, family #785, county clerk offices, New York; FHL microfilm 1,930,199.
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC7T-J8J : 18 February 2021), Mary Blackwell in entry for Jacob Blackwell, 13th Ward Brooklyn, Kings, New York, United States, 1860.
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