TY  - GEN
AU  - Wheal, Caroline
ED  - United Nations Environment Programme.
ED  - Global Environment Monitoring System.
TI  - Freshwater pollution
T2  - UNEP/GEMS environment library ; no.6
PY  - 1991///
CY  - Nairobi : 
PB  - United Nations Environment Programme
KW  - Fresh water
KW  - Water pollution
KW  - Prevention and control
ER  -