TY  - RPRT
TI  - Preliminary map of titanium provinces in the conterminous United States
AU  - Edwin Wilson Tooker
AU  - Eric R. Force
PY  - 1980
DO  - 10.3133/ofr79576k
UR  - https://pubs.usgs.gov/publication/ofr79576K
ID  - ofr79576K
ER  -