USGS international activities in coal resources /
Warwick, Peter D.
SanFilipo, John R.
Finkelman, Robert B.(Robert Barry)
Geological Survey (U.S.)
[Reston, VA?] : U.S. Geological Survey,
[1999].
Caption title.
"June 1999"--P. [1].
"U.S. Department of the Interior, U.S. Geological Survey"--P. [1].
Includes bibliographical references (p. [4]).
Coal