TY  - BOOK
AU  - Wheal,Caroline,text
ED  - United Nations Environment Programme.
ED  - Global Freshwater quality.
TI  - Freshwater pollution
T2  - UNEP/GEMS environment library
SN  - 92-1-100578-7
AV  - TD425 F74 1991
PY  - 1991///
CY  - Nairobi
PB  - UNEP
N1  - Incluye bibliografia
ER  -