@misc{indiciae643db09ab6ba,
  title = {check\_picks\_x: A program for checking the travel time picks of crosswell seismic and radar data},
  author = {Karl Ellefsen},
  year = {2000},
  doi = {10.3133/ofr00109},
  url = {https://pubs.usgs.gov/publication/ofr00109},
  note = {Source identifier: ofr00109}
}