@misc{indiciae963ff8bf8bac,
  title = {Water-resources data for deep aquifers of eastern Montana},
  author = {W.B. Hopkins},
  year = {1976},
  doi = {10.3133/wri7640},
  url = {https://pubs.usgs.gov/publication/wri7640},
  note = {Source identifier: wri7640}
}