TY  - RPRT
TI  - USGS research on mineral resources, 1991; program and abstracts
AU  - Elizabeth E. Good
AU  - John F. Slack
AU  - Rama K. Kotra
PY  - 1991
DO  - 10.3133/cir1062
UR  - https://pubs.usgs.gov/publication/cir1062
ID  - cir1062
ER  -