@misc{indiciaef9d83171842b,
  title = {A regional classification scheme for estimating reference water quality in streams using land-use-adjusted spatial regression-tree analysis},
  author = {Dale M. Robertson and D. A. Saad and D.M. Heisey},
  year = {2005},
  doi = {10.1007/s00267-005-0022-8},
  url = {https://pubs.usgs.gov/publication/70030934},
  note = {Source identifier: 70030934}
}