@misc{indiciaee8e43fe8e674,
  title = {Development of sinkholes resulting from man's activities in the Eastern United States},
  author = {John G. Newton},
  year = {1987},
  doi = {10.3133/cir968},
  url = {https://pubs.usgs.gov/publication/cir968},
  note = {Source identifier: cir968}
}