@misc{indiciae994261885fc7,
  title = {Detection and mapping of fractures and cavities using borehole radar},
  author = {F.P. Haeni and Lucien Halleux and Carole D. Johnson and John W. Lane},
  year = {2002},
  url = {https://pubs.usgs.gov/publication/70206347},
  note = {Source identifier: 70206347}
}