@misc{indiciae6aa9043e88ec,
  title = {Photogeologic and reconnaissance geologic map of the Montague Butte Quadrangle, Custer County, Montana},
  author = {S. J. Luft and R. B. Colton},
  year = {1984},
  doi = {10.3133/mf1704},
  url = {https://pubs.usgs.gov/publication/mf1704},
  note = {Source identifier: mf1704}
}