@misc{indiciaee49e168558c3,
  title = {Digital simulation of ground-water flow in the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming},
  author = {R. R. Luckey and E. D. Gutentag and F.J. Heimes and J.B. Weeks},
  year = {1986},
  doi = {10.3133/pp1400d},
  url = {https://pubs.usgs.gov/publication/pp1400D},
  note = {Source identifier: pp1400D}
}