APA (7th ed.) Citation

Geological Survey (U.S.). (1999). National Coal Quality Inventory (NaCQI) and U.S. Geological Survey coal quality databases. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). National Coal Quality Inventory (NaCQI) and U.S. Geological Survey Coal Quality Databases. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

MLA (9th ed.) Citation

Geological Survey (U.S.). National Coal Quality Inventory (NaCQI) and U.S. Geological Survey Coal Quality Databases. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.