@misc{indiciae96b83fdd4927,
  title = {Detection of bedrock fractures and lithologic changes using borehole radar at selected sites},
  author = {John W. Lane and F.P. Haeni and John H. Williams},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/70206254},
  note = {Source identifier: 70206254}
}