@misc{indiciae01cf54cf8127,
  title = {pick\_sw; a program for interactive picking of S-wave refraction data},
  author = {Karl J. Ellefsen},
  year = {2000},
  doi = {10.3133/ofr0020},
  url = {https://pubs.usgs.gov/publication/ofr0020},
  note = {Source identifier: ofr0020}
}