@misc{indiciaed3f7ebe71371,
  title = {Slides showing preliminary geologic maps of the Butte 1 degree x 2 degrees Quadrangle, western Montana},
  author = {C. A. Wallace and R. G. Schmidt},
  year = {1982},
  doi = {10.3133/ofr82713},
  url = {https://pubs.usgs.gov/publication/ofr82713},
  note = {Source identifier: ofr82713}
}