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Environmental Council of the States (U.S.). Sludge Management Task Committee of the Environmental Council, Environmental and Water Resources Institute (U.S.), Inc ebrary, agus R. D. Tyagi. Sustainable Sludge Management: Production of Value Added Products. Reston, VA: American Society of Civil Engineers, 2009.

Environmental Council of the States (U.S.). Sludge Management Task Committee of the Environmental Council, et al. Sustainable Sludge Management: Production of Value Added Products. American Society of Civil Engineers, 2009.