@misc{indiciae85ecca83ea4a,
  title = {Geohydrology of the shallow aquifers in the Greeley-Nunn area, Colorado},
  author = {Stanley G. Robson and L. R. Arnold and Janet S. Heiny},
  year = {2000},
  doi = {10.3133/ha746a},
  url = {https://pubs.usgs.gov/publication/ha746A},
  note = {Source identifier: ha746A}
}