@misc{indiciaeecd32a99820b,
  title = {Geologic map of the Hatfield Mountain quadrangle, Gallatin County, Montana},
  author = {Betty Skipp and Mary-Margaret Hepp},
  year = {1968},
  doi = {10.3133/gq729},
  url = {https://pubs.usgs.gov/publication/gq729},
  note = {Source identifier: gq729}
}