@misc{indiciae57c7a696ddaf,
  title = {Digital map of areas of little or no saturated thickness for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming},
  author = {Joel R. Cederstrand and Mark F. Becker},
  year = {1999},
  doi = {10.3133/ofr99266},
  url = {https://pubs.usgs.gov/publication/ofr99266},
  note = {Source identifier: ofr99266}
}