@misc{indiciae4dae796222d1,
  title = {Baseline water quality of Iowa's coal region},
  author = {Larry J. Slack},
  year = {1979},
  doi = {10.3133/ofr79980},
  url = {https://pubs.usgs.gov/publication/ofr79980},
  note = {Source identifier: ofr79980}
}