@misc{indiciae88c66eb5de5c,
  title = {Cross sections showing coal stratigraphy of the central Powder River basin, Wyoming and Montana},
  author = {C. L. Molnia and F. W. Pierce},
  year = {1992},
  doi = {10.3133/i1959d},
  url = {https://pubs.usgs.gov/publication/i1959D},
  note = {Source identifier: i1959D}
}