TY  - RPRT
TI  - Reconnaissance geologic map of the northern two-thirds of the Avon quadrangle, Lewis and Clark, and Powell Counties, Montana
AU  - W. Mark Weber
AU  - Irving Jerome Witkind
PY  - 1979
DO  - 10.3133/ofr79437
UR  - https://pubs.usgs.gov/publication/ofr79437
ID  - ofr79437
ER  -