@misc{indiciaee2baadcf0bdc,
  title = {Guide for the calculation of coal resources using the computer program GARNET},
  author = {Sharon S. Crowley and Antoinette L. Medlin and R. J. Smith},
  year = {1981},
  doi = {10.3133/ofr81563},
  url = {https://pubs.usgs.gov/publication/ofr81563},
  note = {Source identifier: ofr81563}
}