@misc{indiciae81cd1329ca2b,
  title = {Geologic map of the Rogers Pass Quadrangle, Lewis and Clark County, Montana},
  author = {J. W. Whipple and M.L. Bregman},
  year = {1981},
  doi = {10.3133/mf1309},
  url = {https://pubs.usgs.gov/publication/mf1309},
  note = {Source identifier: mf1309}
}