@misc{indiciaeb8e2ba940c7b,
  title = {Quality assurance for water-quality activities of the U.S. Geological Survey in Montana},
  author = {J. R. Knapton and D. A. Nimick},
  year = {1991},
  doi = {10.3133/ofr91216},
  url = {https://pubs.usgs.gov/publication/ofr91216},
  note = {Source identifier: ofr91216}
}