@misc{indiciaeb13e812abba5,
  title = {Availability of low-sulphur coal in Mingo County, West Virginia},
  author = {Frank D. Spencer},
  year = {1972},
  doi = {10.3133/ofr72358},
  url = {https://pubs.usgs.gov/publication/ofr72358},
  note = {Source identifier: ofr72358}
}