@misc{indiciaec761dd82361f,
  title = {Occurrence and distribution of microbiological indicators in groundwater and stream water},
  author = {Donna S. Francy and Dennis R. Helsel and Rebecca A. Nally},
  year = {2000},
  doi = {10.2175/106143000x137220},
  url = {https://pubs.usgs.gov/publication/70022914},
  note = {Source identifier: 70022914}
}