TY  - RPRT
TI  - A study of trends in total phosphorus measurements at NASQAN stations
AU  - Richard A. Smith
AU  - Robert M. Hirsch
AU  - James Richard Slack
PY  - 1982
DO  - 10.3133/wsp2190
UR  - https://pubs.usgs.gov/publication/wsp2190
ID  - wsp2190
ER  -