@misc{indiciae1074e3edee59,
  title = {A graphical kernel system (GKS) version of computer program MODPATH-PLOT for displaying path lines generated from the U.S. Geological Survey modular three-dimensional ground-water flow model},
  author = {D.W. Pollock},
  year = {1990},
  doi = {10.3133/ofr89622},
  url = {https://pubs.usgs.gov/publication/ofr89622},
  note = {Source identifier: ofr89622}
}