@misc{indiciae280dbc9bdd14,
  title = {Index to water-quality data available from the U.S. Geological Survey in machine-readable form to December 31, 1972-Central Region},
  author = {C.R. Showen and O.O. Williams},
  year = {1973},
  doi = {10.3133/wri7323},
  url = {https://pubs.usgs.gov/publication/wri7323},
  note = {Source identifier: wri7323}
}