APA (7th ed.) Citation

Spencer, F. D. (1964). Geology of the Boltsfork quadrangle and part of the Burnaugh quadrangle, Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Spencer, Frank Darwyn. Geology of the Boltsfork Quadrangle and Part of the Burnaugh Quadrangle, Kentucky. Reston, Va.: U.S. Geological Survey, 1964.

MLA (8th ed.) Citation

Spencer, Frank Darwyn. Geology of the Boltsfork Quadrangle and Part of the Burnaugh Quadrangle, Kentucky. U.S. Geological Survey, 1964.