Coal--a complex natural resource : an overview of factors affecting coal quality and use in the United States / by Stanley P. Schweinfurth ; with a contribution on coal quality and public health by Robert B. Finkelman.
Publicacion
Reston, Va : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Information Services [distributor], 2003.
