Lassen Volcanic, Calif.
Mesa Verde, Colo.
Mount McKinley, Alaska.
Mount Rainier, Wash.
National Capital Parks, Washington, D.C.
Platt, Okla. Sequoia, Calif.
Wind Cave, S. Dak.
Yellowstone, Wyo.-Idaho-Mont.
Yosemite, Calif.
Zion and Bryce Canyon, Utah.