@misc{indiciaed84bd668020a,
  title = {Behaviour of abandoned room and pillar mines in Illinois},
  author = {G.G. Marino and R.A. Bauer},
  year = {1989},
  doi = {10.1007/bf00896592},
  url = {https://pubs.usgs.gov/publication/70015012},
  note = {Source identifier: 70015012}
}