@misc{indiciae2407dc20e533,
  title = {Geologic map of the Wallrock Quadrangle, Gallatin and Park counties, Montana},
  author = {B. A. Skipp},
  year = {1974},
  doi = {10.3133/ofr74110},
  url = {https://pubs.usgs.gov/publication/ofr74110},
  note = {Source identifier: ofr74110}
}