@misc{indiciae562f56572981,
  title = {Yearly variations in runoff and frequency of dry years for the conterminous United States, 1911-79},
  author = {W. B. Langbein and J. R. Slack},
  year = {1982},
  doi = {10.3133/ofr82751},
  url = {https://pubs.usgs.gov/publication/ofr82751},
  note = {Source identifier: ofr82751}
}