Robert Duvall stars in a charming period piece as a solitary wildcat oilman in the Texas dust bowl during the mid-1930s in a picture produced by Clint Eastwood and directed by James Keach from a script by Philip Railsback. The plot is fairly conventional, but the period flavor is wonderful and the castwhich also includes Aidan Quinn, Frances Fisher, and Brian Dennehyis first-rate. (JR)