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2. Standard Methods for the Examination of Water and Wastewater;American Public Health Association,1975
3. Methods of Analysis;Association Official Agricultural Chemists,1960
4. Summerkill risk in prairie ponds and possibilities of its prediction;Barica;J. Fish. Res. Board Can.,1975
5. Losses of mineral nutrients during decomposition of Typha latifolia;Boyd;Arch. Hydrobiol.,1970