@misc{indiciae4a68a74ada71,
  title = {Water quality of hydrologic bench marks; an indicator of water quality in the natural environment},
  author = {James E. Biesecker and Donald K. Leifeste},
  year = {1974},
  doi = {10.3133/cir460e},
  url = {https://pubs.usgs.gov/publication/cir460E},
  note = {Source identifier: cir460E}
}