@misc{indiciae1d17c177be1b,
  title = {Isopach maps of the Powder River Basin, Montana and Wyoming},
  author = {J. E. Fox and Debra K. Higley},
  year = {1996},
  doi = {10.3133/oc147b},
  url = {https://pubs.usgs.gov/publication/oc147B},
  note = {Source identifier: oc147B}
}