APA (7th ed.) Citation

Peterson, W. L. (1977). Geologic map of the Cardwell quadrangle, Washington and Mercer counties, Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Peterson, Warren Lee. Geologic Map of the Cardwell Quadrangle, Washington and Mercer Counties, Kentucky. Reston, Va.: U.S. Geological Survey, 1977.

MLA (9th ed.) Citation

Peterson, Warren Lee. Geologic Map of the Cardwell Quadrangle, Washington and Mercer Counties, Kentucky. U.S. Geological Survey, 1977.