TY  - RPRT
TI  - Quality of nutrient data from streams and ground water sampled during 1993-95; National Water-Quality Assessment Program
AU  - David K. Mueller
PY  - 1998
DO  - 10.3133/ofr98276
UR  - https://pubs.usgs.gov/publication/ofr98276
ID  - ofr98276
ER  -