TY  - BOOK
AU  - Meybeck,M.
AU  - Helmer,Richard
AU  - Chapman,Deborah V.
ED  - Global Environmental Monitoring System.
ED  - United Nations Environment Programme.
ED  - World Health Organization.
TI  - Global freshwater quality: a first assessment
SN  - 0631173145
AV  - TD370 .G56 1990
U1  - 363.73/942 20
PY  - 1990///
CY  - Cambridge, Mass., U.S.A.
PB  - Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference
KW  - Water quality
KW  - Local
KW  - Water
KW  - Pollution
N1  - At head of title: Global Environment Monitoring System
ER  -