TY  - RPRT
TI  - National Water-Quality Assessment: Ground-water pilot program
AU  - William M. Alley
AU  - William G. Wilber
PY  - 1988
DO  - 10.3133/ofr88175
UR  - https://pubs.usgs.gov/publication/ofr88175
ID  - ofr88175
ER  -