@misc{indiciae513defbaeab6,
  title = {Preliminary geologic map of the Dillon 1? x 2? Quadrangle, Montana},
  author = {Edward Thompson Ruppel and J.M. O’Neill and David A. Lopez},
  year = {1983},
  doi = {10.3133/ofr83168},
  url = {https://pubs.usgs.gov/publication/ofr83168},
  note = {Source identifier: ofr83168}
}