TY  - RPRT
TI  - Preliminary geologic map of Portage quadrangle, Montana, surficial geology
AU  - Richard Walter Lemke
AU  - Edwin K. Maughan
PY  - 1954
DO  - 10.3133/ofr54166
UR  - https://pubs.usgs.gov/publication/ofr54166
ID  - ofr54166
ER  -