@misc{indiciae4442af9caa42,
  title = {Coal resource occurrence and coal development potential maps of the Pine Butte School quadrangle, Big Horn County, Montana},
  author = {William Craven Culbertson and L. N. Robinson and T. M. Gaffke},
  year = {1978},
  doi = {10.3133/ofr78652},
  url = {https://pubs.usgs.gov/publication/ofr78652},
  note = {Source identifier: ofr78652}
}