@misc{indiciaeb068b0ae5869,
  title = {Investigation of the quality of ground water in the vicinity of Derby, Colorado},
  author = {L. R. Petri and R.O. Smith},
  year = {1959},
  doi = {10.3133/ofr5993},
  url = {https://pubs.usgs.gov/publication/ofr5993},
  note = {Source identifier: ofr5993}
}