N. F. Gray

• Water technology
• Biology of wastewater treatment
• Activated sludge
• Fixed-Film Reactors in Wastewater Treatment
• Biology of Wastewater Treatment (Second Edition)(Series on Environmental Science and Management ¿ Vol. 4)
• Calidad del Agua Potable - Problemas y Soluciones
• Drinking water quality
• Water technology
• Drinking Water Quality 2ed
• Essential Reference Bundle
• Facing up to Global Warming
• Introduction to wastewater treatment