@misc{indiciae4874745a2dfd,
  title = {Statistical Methods and Sampling Design for Estimating Step Trends in Surface-Water Quality},
  author = {Robert M. Hirsch},
  year = {2007},
  doi = {10.1111/j.1752-1688.1988.tb00899.x},
  url = {https://pubs.usgs.gov/publication/70013756},
  note = {Source identifier: 70013756}
}