@misc{indiciae0cffa7d90ba5,
  title = {Bituminous coal resources of Texas},
  author = {W. J. Mapel},
  year = {1967},
  doi = {10.3133/b1242d},
  url = {https://pubs.usgs.gov/publication/b1242D},
  note = {Source identifier: b1242D}
}