@misc{indiciaef3eaa4beb215,
  title = {Index to US Geological Survey computer files containing daily values for water parameters to September 30, 1971: Central region},
  author = {Charles R. Showen and Neil G. Stuthmann},
  year = {1973},
  doi = {10.3133/wri7327},
  url = {https://pubs.usgs.gov/publication/wri7327},
  note = {Source identifier: wri7327}
}