@misc{indiciaebcb7a7745edb,
  title = {Physical environment and hydrologic characteristics of coal-mining areas in Missouri},
  author = {J. E. Vaill and James H. Barks},
  year = {1980},
  doi = {10.3133/wri8067},
  url = {https://pubs.usgs.gov/publication/wri8067},
  note = {Source identifier: wri8067}
}