TY  - RPRT
TI  - Generalized boundaries of the National Water-Quality Assessment (NAWQA) Study-Unit Investigations in the conterminous United States 2001-2012
AU  - K.J. Hitt
PY  - 2006
DO  - 10.3133/70046921
UR  - https://pubs.usgs.gov/publication/70046921
ID  - 70046921
ER  -