TY  - RPRT
TI  - Preliminary map of manganese provinces in the conterminous United States
AU  - Edwin Wilson Tooker
AU  - William F. Cannon
PY  - 1980
DO  - 10.3133/ofr79576o
UR  - https://pubs.usgs.gov/publication/ofr79576O
ID  - ofr79576O
ER  -