@misc{indiciae0b2920123e52,
  title = {Programmable calculators; modern instruments for analyzing hydrologic data},
  author = {David V. Maddy},
  year = {1976},
  doi = {10.3133/ofr75642},
  url = {https://pubs.usgs.gov/publication/ofr75642},
  note = {Source identifier: ofr75642}
}