@misc{indiciae22107113e870,
  title = {Documentation of computer programs to compute and display pathlines using results from the U.S. Geological Survey modular three-dimensional finite-difference ground-water flow model},
  author = {David W. Pollock},
  year = {1989},
  doi = {10.3133/ofr89381},
  url = {https://pubs.usgs.gov/publication/ofr89381},
  note = {Source identifier: ofr89381}
}