TY  - RPRT
TI  - A statistical summary of data from the U.S. Geological Survey's national water quality networks
AU  - R. A. Smith
AU  - R. B. Alexander
PY  - 1983
DO  - 10.3133/ofr83533
UR  - https://pubs.usgs.gov/publication/ofr83533
ID  - ofr83533
ER  -