@misc{indiciae1314b8e64a18,
  title = {Engineering geology applied to the design and operation of underground coal mines},
  author = {C. Richard Dunrud},
  year = {1998},
  doi = {10.3133/b2147},
  url = {https://pubs.usgs.gov/publication/b2147},
  note = {Source identifier: b2147}
}