@misc{indiciaee9b74c9e72d9,
  title = {The use of vertical seismic profiles in seismic investigations of the earth},
  author = {Alfred H. Balch and Myung W. Lee and J. J. Miller and Robert T. Ryder},
  year = {1982},
  doi = {10.1190/1.1441357},
  url = {https://pubs.usgs.gov/publication/70188674},
  note = {Source identifier: 70188674}
}