"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN7P-38P : 17 October 2014), William Spencer, Connecticut, United States; citing p. 18, family 148, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,613.
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