APA (7th ed.) Citation

Campbell, M. R. (1893). Geology of the Big Stone Gap coal field of Virginia and Kentucky. Department of the Interior, United States Geological Survey.

Chicago Style (17th ed.) Citation

Campbell, Marius R. Geology of the Big Stone Gap Coal Field of Virginia and Kentucky. Washington, D.C.: Department of the Interior, United States Geological Survey, 1893.

MLA (9th ed.) Citation

Campbell, Marius R. Geology of the Big Stone Gap Coal Field of Virginia and Kentucky. Department of the Interior, United States Geological Survey, 1893.