@misc{1180396,
  author = {Alan D Davies and A Philip Cramp},
  title = {Coal taxonomy thesaurus of terms:},
  year = {1981},
  month = {1981-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.81-2405},
  language = {en},
}