1. The Biology of Polluted Waters;Hynes,1960
2. River Pollution, II, Causes and Effects;Klein,1962
3. Biological Associated Problems in Freshwater Environments - Their Identification, Investigation and Control;Mackenthun,1967
4. Chemistry for Sanitary Engineers;Sawyer,1967
5. Biology of Water Pollution: A Collection of Selected Papers on Stream Pollution, Waste-Water and Water Treatment;Keup,1967