@misc{indiciaeb2a8b28017df,
  title = {Structure-contour maps of the Powder River basin, Montana and Wyoming},
  author = {J. E. Fox and Debra K. Higley},
  year = {1996},
  doi = {10.3133/oc147a},
  url = {https://pubs.usgs.gov/publication/oc147A},
  note = {Source identifier: oc147A}
}