TY  - RPRT
TI  - Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin ground water management area, Washington
AU  - Lonna M. Frans
AU  - Dennis R. Helsel
PY  - 2005
DO  - 10.3133/sir20055078
UR  - https://pubs.usgs.gov/publication/sir20055078
ID  - sir20055078
ER  -