TY  - BOOK
AU  - Helmer,Richard
AU  - Hespanhol,Ivanildo
ED  - United Nations Environment Programme.
ED  - Water Supply and Sanitation Collaborative Council.
ED  - World Health Organization.
TI  - Water pollution control: a guide to the use of water quality management principles 
SN  - 0419229108
AV  - TD365 .W364 1997
U1  - 363.739/4 21
PY  - 1997///
CY  - London, New York
PB  - E & FN Spon
KW  - Water quality management
KW  - Water
KW  - Purification
N1  - "Published on behalf of UNEP, United Nations Environment Program, Water Supply & Sanitation Collaborative Council, World Health Organization."; Includes bibliographical references and index
UR  - http://www.loc.gov/catdir/enhancements/fy0651/98 123030-d.html
ER  -