@misc{indiciae307833f6320c,
  title = {Geologic map of the Rogers Pass area, Lewis and Clark County, Montana},
  author = {J. W. Whipple and M. R. Mudge and R.L. Earhart},
  year = {1987},
  doi = {10.3133/i1642},
  url = {https://pubs.usgs.gov/publication/i1642},
  note = {Source identifier: i1642}
}