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2. Swine Wastes, Characterisation and Anaerobic Digestion;Schmid,1969
3. Treatment of Farm Wastes;Scheltinga,1970
4. Farm wastes;Scheltinga;J. Inst. Wat. Pollut. Control,1969
5. Wastesfrom Pig Production Units;Baxter;J. Inst. Wat. Pollut. Control,1968