Rescue teams searching for Mountain View, Mo. woman in national forest •last seen at a residence west of Mountain View, about 3 p.m. Wednesday. •family last heard from her on May 20. •Investigators believe she was heading to Winona. •National Park Service Rangers discovered her unoccupied pickup truck within Ozark National Scenic Riverways at Buck Hollow, on the Jacks Fork River, along State Highway 17 North about 1:30 p.m. on Thursday. •Items found at the scene suggest she might be injured. Special Agents with the National Park Service Investigative Services Branch have opened a missing person investigation in coordination with the Texas County Sheriff's Department and Missouri Highway Patrol.