@misc{indiciae204757f36e52,
  title = {Description of the physical environment and coal-mining history of west-central Indiana, with emphasis on six small watersheds},
  author = {Jeffrey D. Martin and Charles G. Crawford and Richard F. Duwelius and Danny E. Renn},
  year = {1990},
  doi = {10.3133/wsp2368a},
  url = {https://pubs.usgs.gov/publication/wsp2368A},
  note = {Source identifier: wsp2368A}
}