TY  - BOOK
AU  - Candela L. ed.
TI  - Proceedings of the workshop on Agricultural threats to groundwater quality, Zaragoza, Spain, 27-30 October, 1996
U1  - (047.3)556.3:63(46) C17A 
PY  - 1998///
CY  - Paris
PB  - UNESCO/IHP
KW  - Agricultural threats to groundwater quality
ER  -