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2. US EPA, Process Design Manual for Sludge Treatment and Disposal, EPA-625/1-79-011, US Environmental Protection Agency, Washington, DC, 1979.
3. US EPA, Innovative and Alternating Technology Assessment Manual, EPA/430-/9-78-009, US Environmental Protection Agency, Washington, DC, 1980.
4. US EPA, Design Manual: Dewatering Municipal Wastewater Sludge, EPA/625/1-87, US Environmental Protection Agency, Washington, DC, 1987.
5. US EPA, Handbook: Septage Treatment and Disposal, EPA-625/6-84-009, US Environmental Protection Agency, Washington, DC, 1984.