@misc{indiciae4a519a9d562f,
  title = {An iterative digital model for aquifer evaluation},
  author = {George Francis Pinder},
  year = {1969},
  doi = {10.3133/ofr69207},
  url = {https://pubs.usgs.gov/publication/ofr69207},
  note = {Source identifier: ofr69207}
}