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Previous	GV,557 M4 Manual on methods for the assessment of secondary productivity in Fresh Waters.Edn.2.	GV,557:55A L4 Pollution ecology of freshwater invertibrates, with contribns by John Cairns Jr and others.	GV:5576 M6 Ecology of streams and reviers.	GV,5576:55A.2G P0 Cleaning-up the ganges: A cost benefit analysis of the ganga plan	GV,5576:55A.2G P0 Cleaning up the ganges: A cost benefit analysis of the ganga action plan	GV,557z7 L8 Freshwater wetlands:Ecological processes and management potential, with contribns by Dennis F Whigham and others.	GV:55A Principles of toxicology	Next

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