"United States Civil War Soldiers Index, 1861-1865," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F9RC-223 : 4 December 2014), Isaac S. Shields, Private, Company E, 1st Regiment, Maine Cavalry, Union; citing NARA microfilm publication M543 (Washington D.C.: National Archives and Records Administration, n.d.), roll 19; FHL microfilm 881,865. Co E, First Maine Cavalry.
"Maine Marriages, 1771-1907," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4FJ-95H : 10 February 2018), Isaac Shields and Rebecca J. Sterritt, 04 Apr 1867; citing Linneus, Aroostook, Maine, reference ; FHL microfilm 11,352.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6D8-RS4 : 12 April 2016), Isaac Shields, Maine, United States; citing p. 8, family 43, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,037.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF3N-6FD : 14 August 2017), Isaac S Shields, Linneus, Aroostook, Maine, United States; citing enumeration district ED 216, sheet 375A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0477; FHL microfilm 1,254,477.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MML8-CPD : accessed 11 November 2018), Isaac Shields, Linneus town & T.A-R.2, Aroostook, Maine, United States; citing enumeration district (ED) 29, sheet 11A, family 179, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,589.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MRSY-KDW : accessed 11 November 2018), Issaac Shields, Linneus, Aroostook, Maine, United States; citing enumeration district (ED) ED 36, sheet 4B, family 93, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 537; FHL microfilm 1,374,550.
"United States General Index to Pension Files, 1861-1934", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDP-HBN2 : 13 March 2018), Isaac Shields, 1881. 4 Oct 1881 to Isaac, 30 Oct 1915 to widow Rebecker Shields. First Maine Cavalry.
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