APA (7th ed.) Citation

Geological Survey (U.S.) & Ryals, G. N. (1981). Potentiometric surface maps of the Sparta Sand ; northern Louisiana and southern Arkansas,1900, 1965, 1975, and 1980. Department of the Interior, United States Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and G. N. Ryals. Potentiometric Surface Maps of the Sparta Sand ; Northern Louisiana and Southern Arkansas,1900, 1965, 1975, and 1980. [Reston, Va.]: Department of the Interior, United States Geological Survey, 1981.

MLA (9th ed.) Citation

Geological Survey (U.S.) and G. N. Ryals. Potentiometric Surface Maps of the Sparta Sand ; Northern Louisiana and Southern Arkansas,1900, 1965, 1975, and 1980. Department of the Interior, United States Geological Survey, 1981.