TY  - RPRT
TI  - National water information system user's manual; Volume 2, Chapter 2, Water-quality system
AU  - D.V. Maddy
AU  - L.E. Lopp
AU  - D.L. Jackson
AU  - R.H. Coupe
AU  - T. L. Schertz
PY  - 1989
DO  - 10.3133/ofr89617
UR  - https://pubs.usgs.gov/publication/ofr89617
ID  - ofr89617
ER  -