@misc{indiciaeb6766c56a3bf,
  title = {Effects of coal mining on the water resources of the Tradewater River Basin, Kentucky},
  author = {Hayes F. Grubb and Paul D. Ryder},
  year = {1973},
  doi = {10.3133/wsp1940},
  url = {https://pubs.usgs.gov/publication/wsp1940},
  note = {Source identifier: wsp1940}
}