TY  - RPRT
TI  - Environmental water-quality zones for streams: A regional classification scheme
AU  - Dale M. Robertson
AU  - D. A. Saad
PY  - 2003
DO  - 10.1007/s00267-002-2955-5
UR  - https://pubs.usgs.gov/publication/70026026
ID  - 70026026
ER  -