APA (7th ed.) Citation

Wood, G. H. (1983). Coal resource classification system of the U.S. Geological Survey. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Wood, Gordon H. Coal Resource Classification System of the U.S. Geological Survey. [Reston, Virginia]: U.S. Department of the Interior, U.S. Geological Survey, 1983.

MLA (9th ed.) Citation

Wood, Gordon H. Coal Resource Classification System of the U.S. Geological Survey. U.S. Department of the Interior, U.S. Geological Survey, 1983.