@misc{indiciaeaa6a53f7fefa,
  title = {Water-level sensing device},
  author = {E.G. Barron},
  year = {1964},
  doi = {10.3133/ofr6411},
  url = {https://pubs.usgs.gov/publication/ofr6411},
  note = {Source identifier: ofr6411}
}