@misc{indiciae0892b5e20ea8,
  title = {Nonparametric tests for trends in water-quality data using the statistical analysis system},
  author = {Charles G. Crawford and James R. Slack and Robert M. Hirsch},
  year = {1983},
  doi = {10.3133/ofr83550},
  url = {https://pubs.usgs.gov/publication/ofr83550},
  note = {Source identifier: ofr83550}
}