Hearing on H.R. 588, to Amend the National Trails System Act to Create a New Category of Long-Distance Trails to Be Known as National Discovery Trails, to Authorize the American Discovery Trail as the First Trail in That Category, and for Other Purposes; and H.R. 1513, a Bill to Amend the National Trails System Act to Designate the Lincoln National Historic Trail as a Component of the National Trails System