APA (7th ed.) Citation

Williams, R. S., & Clark, G. M. (1994). Hydrology and geochemistry of a surface coal mine in northwestern Colorado. U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Williams, Robert S., and Gregory M. Clark. Hydrology and Geochemistry of a Surface Coal Mine in Northwestern Colorado. Denver, Colo.: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

MLA (9th ed.) Citation

Williams, Robert S., and Gregory M. Clark. Hydrology and Geochemistry of a Surface Coal Mine in Northwestern Colorado. U.S. Dept. of the Interior, U.S. Geological Survey, 1994.