Found him on the 1900 Paynesville, Stearns, Minnesota census (dist 164 img 21) as August O. Finger
age 11 months.
Found him on the 1910 Lemmon Ward 2, Perkins, South Dakota census (dist 97 img 1) as Oliver Finger
He signed his WWI Draft Registration
as Oliver A. Finger
Found him on the 1920 Bixby, Perkins, South Dakota census (dist 74 img 1) as Oliver A. Finger
age 20, single, living at home, shepherd, sheep ranch.