Water pollution control : a guide to the use of water quality management principles /
Helmer, Richard,1943-
Hespanhol, Ivanildo.
London ; New York : E & FN Spon,
1997.
"Published on behalf of UNEP, United Nations Environment Program, Water Supply & Sanitation Collaborative Council, World Health Organization."
Includes bibliographical references and index.
Water quality management.
Water