15th- through early-20th-century America Wilderness Act Wilderness Act wilderness areas 15th- through early-20th-century America http://www.wilderness.net/NWPS/WhatIsWilderness continue 15th- through early-20th-century America Wilderness Areas http://www.wilderness.net/NWPS/WhatIsWilderness 15th- through early-20th-century America Wilderness Wilderness.net