TY  - GEN
AU  - 
AU  - Willrich, Ted L., ed.
AU  - Smith, George E., ed.
TI  - Agricultural practices and water quality
SN  - 0813817455
PY  - 1970///
CY  - Iowa
PB  - Iowa State University Press
KW  - Agricultural Practices
KW  - Water Quality
ER  -