TY  - RPRT
TI  - Undiscovered deposits of gold, silver, copper, lead, and zinc in the conterminous United States
AU  - Richard B. McCammon
PY  - 1997
DO  - 10.3133/fs18995
UR  - https://pubs.usgs.gov/publication/fs18995
ID  - fs18995
ER  -