@misc{indiciaef30c7c1ff2c3,
  title = {A computer program in BASIC for construction of two-layer, seismic refraction forward models within which elevation and thickness of the upper layer change and velocities vary laterally within both layers},
  author = {W.P. Hasbrouck},
  year = {1990},
  doi = {10.3133/ofr90320},
  url = {https://pubs.usgs.gov/publication/ofr90320},
  note = {Source identifier: ofr90320}
}