@misc{indiciae8e03cad439b4,
  title = {Appraisal of the quality of ground water in the Helena Valley, Montana},
  author = {K.R. Wilke and Donald L. Coffin},
  year = {1973},
  doi = {10.3133/wri7332},
  url = {https://pubs.usgs.gov/publication/wri7332},
  note = {Source identifier: wri7332}
}