TY  - BOOK
AU  - Fuhrer, Gregory J.
ED  - United States Geological Survey
TI  - The quality of our nations waters: nutrients and pesticides 
SN  - 0607922966
PY  - 1999///
CY  - Washington
PB  - U.s. Government Printing Office
N1  - Refrences: p. 80-82
ER  -