@misc{indiciae7e450a4e7d38,
  title = {Photogeologic and reconnaissance geologic map of the Knob Quadrangle, Custer County, Montana},
  author = {S. J. Luft and R. B. Colton and E.L. Heffern},
  year = {1984},
  doi = {10.3133/mf1702},
  url = {https://pubs.usgs.gov/publication/mf1702},
  note = {Source identifier: mf1702}
}