@misc{indiciae97ba135a25c8,
  title = {Digital map of saturated thickness in 1980 for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, South Dakota, Texas, Wyoming},
  author = {Joel R. Cederstrand and Mark F. Becker},
  year = {1999},
  doi = {10.3133/ofr99262},
  url = {https://pubs.usgs.gov/publication/ofr99262},
  note = {Source identifier: ofr99262}
}