@misc{indiciae14189305a56d,
  title = {Coal resource occurrence and coal development potential maps of the Piney Canyon Northwest quadrangle, Campbell County, Wyoming},
  author = {IntraSearch Inc.},
  year = {1979},
  doi = {10.3133/ofr7977},
  url = {https://pubs.usgs.gov/publication/ofr7977},
  note = {Source identifier: ofr7977}
}