@misc{indiciae1ff40d64998a,
  title = {Improvements to the DRASTIC ground-water vulnerability mapping method},
  author = {Michael G. Rupert},
  year = {1999},
  doi = {10.3133/fs06699},
  url = {https://pubs.usgs.gov/publication/fs06699},
  note = {Source identifier: fs06699}
}