1998 assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States /
U.S. Geological Survey National Mineral Resource Assessment Team.
Washington : U.S. G.P.O. ; Denver, CO : Free on application to U.S. Geological Survey, Information Services,
1999.
System requirements for accompanying computer disc: Windows 95/98/NT.
Includes bibliographical references.
Mines and mineral resources
Ore-deposits