In an Indiana genealogical research guide that I have, it states that naturalization records are available from 1837-1980 at Family History Library/Centers, Indiana State Library, Indiana Historical Society, and many in Allen Co. Public Library in Ft. Wayne, 900 Webster St., Ft Wayne, IN 46802, (219) 421-1200. You might want to try FHL in Evansville, Evansville-Vanderburgh County Public Library, 22 S.E. Fifth St., Evansville, IN 47708, Willard Library, Regional and Family History Center, 21 First Ave., Evansville, IN 47710, Tri-State Genealogical Society, 21 First Ave., Evansville, IN 47712, or Vanderburgh County Historical Society, 201 N.W. Fourth St., Evansville, IN 47712. Good luck, Jack, Indianapolis