@misc{indiciae2212aefa5790,
  title = {Unexpected hydrologic perturbation in an abandoned underground coal mine: Response to surface reclamation?},
  author = {D. Harper and G.A. Olyphant and E.J. Hartke},
  year = {1990},
  doi = {10.1007/bf01706409},
  url = {https://pubs.usgs.gov/publication/70016161},
  note = {Source identifier: 70016161}
}