TY  - BOOK
AU  - Meybeck Michel Ed.
AU  -  Chapman Deborah V Ed.
AU  -  Helmer Richard Ed.
TI  - Global freshwater quality: A first asessement
T2  - Global environment monitoring system
U1  - L:555, M9 
PY  - 1989///
CY  - Oxford
PB  - Basil Blackwell        
KW  -  Water pollution
KW  - Medicine
ER  -