@misc{indiciaeb29840ada91d,
  title = {Preliminary geologic map of parts of the Butte 1 p? sx 2 p? Quadrangle, central Montana},
  author = {C. A. Wallace and R. G. Schmidt and M. R. Waters and D. J. Lidke and A. B. French},
  year = {1981},
  doi = {10.3133/ofr811030},
  url = {https://pubs.usgs.gov/publication/ofr811030},
  note = {Source identifier: ofr811030}
}