@misc{indiciaec4c2d4842884,
  title = {Hydrogeology of the Helena Valley-fill aquifer system, west-central Montana},
  author = {D.W. Briar and J.P. Madison},
  year = {1992},
  doi = {10.3133/wri924023},
  url = {https://pubs.usgs.gov/publication/wri924023},
  note = {Source identifier: wri924023}
}