@misc{indiciae7bd1e9f95961,
  title = {Status of ground-water modeling in the U.S. Geological Survey},
  author = {Charles A. Appel and J.D. Bredehoeft},
  year = {1976},
  doi = {10.3133/cir737},
  url = {https://pubs.usgs.gov/publication/cir737},
  note = {Source identifier: cir737}
}