TY  - BOOK
AU  - Smith,Richard A.
AU  - Hirsch,Robert M.
AU  - Slack,James Richard
TI  - A study of trends in total phosphorus measurements at NASQAN stations
T2  - Geological Survey water-supply paper
U1  - 363.7394 
PY  - 1982///
CY  - Washington, D.C.
PB  - United States Geological Survey
KW  - Water
KW  - Phosphorus content
KW  - Water quality
N1  - Bibliography: p. 34
ER  -