TY  - RPRT
TI  - Preliminary geologic map of the Roberts Mountain quadrangle, Lewis and Clark County, Montana
AU  - R. G. Schmidt
AU  - C.P. Strong
PY  - 1968
DO  - 10.3133/i564
UR  - https://pubs.usgs.gov/publication/i564
ID  - i564
ER  -