@misc{indiciae2bd4007159b4,
  title = {Open-channel integrating-type flow meter},
  author = {K.C. Koopman},
  year = {1971},
  doi = {10.3133/70047678},
  url = {https://pubs.usgs.gov/publication/70047678},
  note = {Source identifier: 70047678}
}