TY  - RPRT
TI  - Background information to accompany the atlas of some metal and nonmetal mineral provinces in the conterminous United States
AU  - Edwin Wilson Tooker
PY  - 1980
DO  - 10.3133/cir792
UR  - https://pubs.usgs.gov/publication/cir792
ID  - cir792
ER  -