TY  - RPRT
TI  - Preface; Water quality of large U.S. rivers; results from the U.S. Geological Survey's National Stream Quality Accounting Network
AU  - Robert M. Hirsch
AU  - Richard P. Hooper
PY  - 2001
DO  - 10.1002/hyp.204
UR  - https://pubs.usgs.gov/publication/70180722
ID  - 70180722
ER  -