@misc{indiciae2de55a6b30f3,
  title = {In-situ seismic wave velocity monitoring},
  author = {T.V. McEvilly and R.W. Clymer},
  year = {1981},
  doi = {10.3133/ofr81285},
  url = {https://pubs.usgs.gov/publication/ofr81285},
  note = {Source identifier: ofr81285}
}