APA (7th ed.) Citation

Knopman, D. S. (1990). Factors related to the water-yielding potential of rocks in the Piedmont and Valley and Ridge provinces of Pennsylvania. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Knopman, Debra S. Factors Related to the Water-yielding Potential of Rocks in the Piedmont and Valley and Ridge Provinces of Pennsylvania. Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 1990.

MLA (9th ed.) Citation

Knopman, Debra S. Factors Related to the Water-yielding Potential of Rocks in the Piedmont and Valley and Ridge Provinces of Pennsylvania. U.S. Dept. of the Interior, U.S. Geological Survey, 1990.