@misc{indiciaed3b9c8f0557c,
  title = {A comprehensive system for interpreting seismic-refraction arrival-time data using interactive computer methods},
  author = {Hans D. Ackermann and Leroy W. Pankratz and D.A. Dansereau},
  year = {1982},
  doi = {10.3133/ofr821065},
  url = {https://pubs.usgs.gov/publication/ofr821065},
  note = {Source identifier: ofr821065}
}