TY  - RPRT
TI  - 1998 Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States
AU  - The U.S. Geological Survey National Mineral Resource Assessment Team
PY  - 2000
DO  - 10.3133/cir1178
UR  - https://pubs.usgs.gov/publication/cir1178
ID  - cir1178
ER  -