@misc{indiciae5eb80e2f393b,
  title = {Geologic map and coal resources of the Pleasantdale Quadrangle, Campbell County, Wyoming},
  author = {S.L. Grazis},
  year = {1977},
  doi = {10.3133/coal76},
  url = {https://pubs.usgs.gov/publication/coal76},
  note = {Source identifier: coal76}
}