@misc{indiciaeb9ddaf7e221a,
  title = {Generalized potentiometric-surface map of the High Plains aquifer in Wyoming, 1981},
  author = {Charles Avery and Robert A. Pettijohn},
  year = {1984},
  doi = {10.3133/wri844033},
  url = {https://pubs.usgs.gov/publication/wri844033},
  note = {Source identifier: wri844033}
}