TY  - RPRT
TI  - Nutrient concentrations and yields in undeveloped stream basins of the United States
AU  - G. M. Clark
AU  - D. K. Mueller
AU  - M.A. Mast
PY  - 2007
DO  - 10.1111/j.1752-1688.2000.tb04311.x
UR  - https://pubs.usgs.gov/publication/70022677
ID  - 70022677
ER  -