@misc{indiciae17ef7260b6ec,
  title = {User's manual for R1D84; interactive modeling of one-dimensional velocity-depth functions},
  author = {James Howard Luetgert},
  year = {1988},
  doi = {10.3133/ofr88247},
  url = {https://pubs.usgs.gov/publication/ofr88247},
  note = {Source identifier: ofr88247}
}