@misc{indiciae76f01b0f2513,
  title = {User guide for MODPATH Version 7—A particle-tracking model for MODFLOW},
  author = {David W. Pollock},
  year = {2016},
  doi = {10.3133/ofr20161086},
  url = {https://pubs.usgs.gov/publication/ofr20161086},
  note = {Source identifier: ofr20161086}
}