"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2HV1-Y41 : 27 December 2014), Jonothan Sprague in entry for Calvin Sprague, Birth 14 May 1824; citing Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm 1,205,247.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6V8-7F8 : 12 April 2016), Anna Sprague, Calais, Washington, Maine, United States; citing family 359, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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DNA Connections
It may be possible to confirm family relationships with Calvin by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: