@misc{indiciae7c96779aff79,
  title = {Geologic map showing the thickness and structure of the Anderson-Wyodak coal bed in the south half of the Powder River basin, northeastern Wyoming},
  author = {N.M. Denson and C. T. Pierson},
  year = {1991},
  doi = {10.3133/i2094b},
  url = {https://pubs.usgs.gov/publication/i2094B},
  note = {Source identifier: i2094B}
}