@misc{indiciaed8d433c2124b,
  title = {Photogeologic and reconnaissance geologic map of the Pennock Creek Quadrangle, Custer County, Montana},
  author = {S. J. Luft},
  year = {1986},
  doi = {10.3133/mf1893},
  url = {https://pubs.usgs.gov/publication/mf1893},
  note = {Source identifier: mf1893}
}