TY  - RPRT
TI  - National Water-Quality Assessment (NAWQA) Study-Unit Investigations in the conterminous United States 1991-2001
AU  - K.J. Hitt
AU  - N. Nakagaki
PY  - 2006
DO  - 10.3133/70046917
UR  - https://pubs.usgs.gov/publication/70046917
ID  - 70046917
ER  -