@misc{indiciae2d09accc6796,
  title = {A two-layer, multiple-coverage seismic refraction method with computer programs in BASIC to expedite its application},
  author = {W.P. Hasbrouck},
  year = {1990},
  doi = {10.3133/ofr90266},
  url = {https://pubs.usgs.gov/publication/ofr90266},
  note = {Source identifier: ofr90266}
}