@misc{indiciaea050c60f4de3,
  title = {Preliminary geologic map and coal deposits of the Appel Butte Quadrangle, Campbell County, Wyoming},
  author = {Gary L. Galyardt},
  year = {1980},
  doi = {10.3133/ofr8053},
  url = {https://pubs.usgs.gov/publication/ofr8053},
  note = {Source identifier: ofr8053}
}