@misc{indiciae413d042afcef,
  title = {Borehole techniques identifying subsurface chimney heights in loose ground-some experiences above underground nuclear explosions},
  author = {R. D. Carroll and J.W. Lacomb},
  year = {1993},
  doi = {10.1016/0148-9062(93)91218-8},
  url = {https://pubs.usgs.gov/publication/70017902},
  note = {Source identifier: 70017902}
}