@misc{indiciae3e46fb5f2ab7,
  title = {Stream gaging by continuous injection of tracer elements},
  author = {W.L. Werrell},
  year = {1967},
  doi = {10.3133/ofr67275},
  url = {https://pubs.usgs.gov/publication/ofr67275},
  note = {Source identifier: ofr67275}
}