@misc{indiciaed4537fd9b8b7,
  title = {Geologic summary of the Appalachian Basin, with reference to the subsurface disposal of radioactive waste solutions},
  author = {George Willis Colton},
  year = {1961},
  doi = {10.3133/ofr6228},
  url = {https://pubs.usgs.gov/publication/ofr6228},
  note = {Source identifier: ofr6228}
}