TY  - RPRT
TI  - Statistical Methods and Sampling Design for Estimating Step Trends in Surface-Water Quality
AU  - Robert M. Hirsch
PY  - 2007
DO  - 10.1111/j.1752-1688.1988.tb00899.x
UR  - https://pubs.usgs.gov/publication/70013756
ID  - 70013756
ER  -