@misc{indiciaece07f9451419,
  title = {Petrography of Permian “Gondwana” coals from boreholes in northwestern Bangladesh, based on semiautomated reflectance scanning},
  author = {Neely Bostick and William J. Betterton and Harold J. Gluskoter and Islam M. Nazrul},
  year = {1991},
  doi = {10.1016/0146-6380(91)90106-t},
  url = {https://pubs.usgs.gov/publication/70016411},
  note = {Source identifier: 70016411}
}