"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6NC-ZBS : 9 September 2017), Harry E Sprague in household of Rodolph C Sprague, St Louis, St Louis, Missouri, United States; citing enumeration district ED 386, sheet 15C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,734.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3DC-GQV : accessed 22 December 2020), Harry E Sprague in household of Rodolphi P Sprague, Precinct 11 St. Louis city Ward 25, St. Louis, Missouri, United States; citing enumeration district (ED) 381, sheet 16A, family 276, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,900.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K3TS-KQ6 : 23 August 2019), Harry E Sprague, 1917-1918.
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DNA Connections
It may be possible to confirm family relationships with Harry 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: