@misc{indiciae14816a36d3d6,
  title = {Photogeologic and reconnaissance geologic map of the First Creek Quadrangle, Custer County, Montana},
  author = {S. J. Luft and E.L. Heffern},
  year = {1986},
  doi = {10.3133/mf1870},
  url = {https://pubs.usgs.gov/publication/mf1870},
  note = {Source identifier: mf1870}
}