@misc{indiciae17f81557212d,
  title = {Acoustic and optical borehole-wall imaging for fractured-rock aquifer studies},
  author = {J.H. Williams and C. D. Johnson},
  year = {2004},
  doi = {10.1016/j.jappgeo.2003.06.009},
  url = {https://pubs.usgs.gov/publication/70027686},
  note = {Source identifier: 70027686}
}