TY  - RPRT
TI  - Reconnaissance geologic map of the northern half of the Helmville Quadrangle, Powell County, Montana
AU  - W. Mark Weber
AU  - Irving Jerome Witkind
PY  - 1979
DO  - 10.3133/ofr79444
UR  - https://pubs.usgs.gov/publication/ofr79444
ID  - ofr79444
ER  -