This is a catchall category for the remaining parks. Here are the designators and number of sites for this category:
National Parkways, 4
National Scenic Trails, 6
National Preserve, 19
National Reserves, 2
National Recreation Areas, 18
National Rivers, 4
National Wild and Scenic Rivers, 10
National Seashores, 10
National Lakeshores, 3
HAPPY TRAILS, STEVE