TY  - RPRT
TI  - Nonparametric tests for trends in water-quality data using the statistical analysis system
AU  - Charles G. Crawford
AU  - James R. Slack
AU  - Robert M. Hirsch
PY  - 1983
DO  - 10.3133/ofr83550
UR  - https://pubs.usgs.gov/publication/ofr83550
ID  - ofr83550
ER  -