@misc{indiciae28af66d052ef,
  title = {Digital map of the elevation of the base of the High Plains Aquifer in the Republican River Basin upstream of Hardy, Nebraska, in parts of Nebraska, Kansas, and Colorado},
  author = {Michaela R. Johnson and James F. Cornwall and Matthew K. Landon},
  year = {2002},
  doi = {10.3133/ofr0264},
  url = {https://pubs.usgs.gov/publication/ofr0264},
  note = {Source identifier: ofr0264}
}