@misc{indiciae7e02c0b3620f,
  title = {Statistical evaluation of hydrologic conditions in the vicinity of abandoned underground coal mines around Cannelburg, Indiana},
  author = {D. Harper and G.A. Olyphant},
  year = {1993},
  doi = {10.1016/0022-1694(93)90269-f},
  url = {https://pubs.usgs.gov/publication/70018359},
  note = {Source identifier: 70018359}
}