Guide to the use of pond systems in South Africa for the purification of raw and partially treated sewage

CSIR Special Report WAT 34, January 1968. This report has since been in great demand. It has also been reprinted for the Jerusalem International Conference on Water Quality and Pollution Research, June 1969, and further reprints were made by the Ann Arbor Science Publishers, Inc., PO Box 1425, Michigan 48106, USA