@misc{indiciaee0c06df22c0f,
  title = {Systems for monitoring and digitally recording water-quality parameters},
  author = {George F. Smoot and James F. Blakey},
  year = {1966},
  doi = {10.3133/70039091},
  url = {https://pubs.usgs.gov/publication/70039091},
  note = {Source identifier: 70039091}
}