@misc{indiciae2b4736eb437e,
  title = {A note on costs of collecting hydrometric flow data in the United States},
  author = {W. B. Langbein and G. E. Harbeck},
  year = {1974},
  doi = {10.1080/02626667409493901},
  url = {https://pubs.usgs.gov/publication/70247303},
  note = {Source identifier: 70247303}
}