@misc{indiciae679dd365b297,
  title = {Preliminary geologic map of the Butte 1 degree by 2 degrees quadrangle, western Montana},
  author = {C. A. Wallace and R. G. Schmidt and D. J. Lidke and M. R. Waters and J. E. Elliott and A. B. French and J. W. Whipple and S. E. Zarske and M. J. Blaskowski and B. A. Heise and R. A. Yeoman and J.M. O’Neill and D. A. Lopez and G. D. Robinson and M. R. Klepper},
  year = {1987},
  doi = {10.3133/ofr86292},
  url = {https://pubs.usgs.gov/publication/ofr86292},
  note = {Source identifier: ofr86292}
}