TY  - RPRT
TI  - Techniques of trend analysis for monthly water-quality data
AU  - Robert M. Hirsch
AU  - James Richard Slack
AU  - Richard A. Smith
PY  - 1981
DO  - 10.3133/ofr81488
UR  - https://pubs.usgs.gov/publication/ofr81488
ID  - ofr81488
ER  -