1. Olympic National Park,
Gunnar O. Fagerlund, U.S. Department of the Interior, National Park
Service, Washington, DC, 1954, 1961, rev. 1965.
2. Badlands National Monument,
Carl R. Swartzlow and Robert F. Upton, U.S. Department of the Interior,
National Park Service, Washington, DC, 1954, rev. 1962.
3. Rocky Mountain National
Park, Edwin C. Alberts, U.S. Department of the Interior,
National Park Service, Washington, DC, 1954.
4. Saguaro National Monument,
Natt N. Dodge, U.S. Department of the Interior, National Park Service,
Washington, DC, 1957.
Saguaro National
Monument, Napier Shelton, U.S. Department of the Interior,
National Park Service, Washington, DC, 1972.
5. Great Smoky Mountains National
Park, Arthur Stupka, U.S. Department of the Interior, National
Park Service, Washington, DC, 1960, 1961.
6. Organ Pipe Cactus National
Monument, U.S. Department of the Interior, National Park
Service, Washington, DC, 1964.
Everglades
Wildguide, Jean Craighead George, U.S. Department of the
Interior, National Park Service, Washington, DC, 1972.
The Life of Isle
Royale, Napier Shelton, U.S. Department of the Interior,
National Park Service, Washington, DC, 1975.
The Nature of
Shenandoah: A Naturalist's Story of a Mountain Park, Napier
Shelton, U.S. Department of the Interior, National Park Service,
Washington, DC, 1975.
Many Storied
Mountains: The Life of Glacier National Park, Greg Beaumont,
U.S. Department of the Interior, National Park Service, Washington, DC,
1978.
The Dinosaur
Quarry, John M. Good, Theodore E. White, and Gilbert F. Stucker,
U.S. Department of the Interior, National Park Service, Washington, DC,
1958.