@misc{indiciae1c40c7f7f2e7,
  title = {Geologic map of the Comb Rock quadrangle, Lewis and Clark County, Montana},
  author = {Robert George Schmidt},
  year = {1972},
  doi = {10.3133/gq976},
  url = {https://pubs.usgs.gov/publication/gq976},
  note = {Source identifier: gq976}
}