1. Wastewater Microbiology
2. Sustainable sludge management in developing countries
3. Hall, J. Sludge management in developing countries. Proceedings of the Joint CIWEM Aqua Enviro Consultancy Services, 5th European Biosolids and Organic Residuals Conference. November20th–22nd2000, Wakefield, United Kingdom. Edited by: Lowe, P. and Hudson, J. A. Wakefield, United Kingdom: Aqua Enviro Consultancy Services. Seminar 1, paper 3