TY  - RPRT
TI  - Preliminary map of fluorine provinces in the conterminous United States
AU  - Ralph Erskine Van Alstine
AU  - Edwin Wilson Tooker
PY  - 1979
DO  - 10.3133/ofr79576g
UR  - https://pubs.usgs.gov/publication/ofr79576G
ID  - ofr79576G
ER  -