@misc{indiciaeb32eb0d82395,
  title = {Geologic map datasets of the Custer and Gallatin National Forests of south-central Montana, in ARC/INFO format},
  author = {G.N. Green and B. S. Van Gosen and A.B. Wilson and J.T. Silkwood},
  year = {1999},
  doi = {10.3133/ofr99450},
  url = {https://pubs.usgs.gov/publication/ofr99450},
  note = {Source identifier: ofr99450}
}