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2. Standard Methods for the Examination of Water and Wastewater;APHA,1980
3. Methods of Soil Analysis. Part 2 — Chemical and Microbiological Properties;ASA-SSSA,1982
4. Methods of Soil Analysis. Part 1 — Physical and Mineralogical Methods;ASA-SSSA,1986
5. A tentative nutrient balance for intensive fish ponds;Avnimelech;Bamidgeh,1979