@misc{indiciae14556abd059f,
  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 R.F. Duwelius and D.E. Renn},
  year = {1987},
  doi = {10.3133/ofr87212},
  url = {https://pubs.usgs.gov/publication/ofr87212},
  note = {Source identifier: ofr87212}
}