@misc{indiciae2a9f24e2d510,
  title = {Coal resource occurrence map of the Little Thunder Reservoir quadrangle, Campbell County, Wyoming},
  author = {G. C. Martin},
  year = {1977},
  doi = {10.3133/ofr7757},
  url = {https://pubs.usgs.gov/publication/ofr7757},
  note = {Source identifier: ofr7757}
}