APA (7th ed.) Citation

Geological Survey (U.S.). (1980). Big Bend National Park, Texas, 1971. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Big Bend National Park, Texas, 1971. Reston, Va.: The Survey, 1980.

MLA (9th ed.) Citation

Geological Survey (U.S.). Big Bend National Park, Texas, 1971. The Survey, 1980.

Warning: These citations may not always be 100% accurate.