TY  - BOOK
AU  - Meybeck,M.
AU  - Chapman,Deborah V.
AU  - Helmer,Richard
ED  - World Health Organization.
ED  - United Nations Environment Programme.
ED  - Global Environmental Monitoring System.
TI  - Global freshwater quality: a first assessment 
SN  - 0631173145 :
AV  - TD370 .G56 1990
U1  - 363.73942 MEY 20
PY  - 1990///
CY  - Oxford, UK, Cambridge, Mass., USA
PB  - Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference
KW  - Water quality
KW  - Water
KW  - Pollution
N1  - At head of title: Global Environment Monitoring System; Includes bibliographical references and index
ER  -