@misc{indiciae8ab42470f16e,
  title = {Preliminary charts of selected structure \& thickness maps and diagrams from the Powder River Basin, Wyoming \& Montana},
  author = {J. E. Fox and L. A. McGrath},
  year = {1986},
  doi = {10.3133/ofr86385},
  url = {https://pubs.usgs.gov/publication/ofr86385},
  note = {Source identifier: ofr86385}
}