@misc{indiciaea1e7fac17be2,
  title = {Geology and coal deposits of the Shelburn quadrangle, Sullivan County, Indiana},
  author = {Courtney Waddell},
  year = {1954},
  doi = {10.3133/coal17},
  url = {https://pubs.usgs.gov/publication/coal17},
  note = {Source identifier: coal17}
}