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551River Usk barrage position statement, 18th January 1991
552Exe freshwater model : quasar model design
553Catchment handbook : River Camel catchment : final draft report
554River Itchen catchment management plan : consultation report
555Macroinvertebrates of the River Nar : Great Ouse catchment : draft report
556River Darent catchment management plan : consultation report
557River Wissey investigations : linking hydrology and ecology March 1994
558Regional water quality monitoring and surveillance programme for 1992 : quality investigations in controlled waters
559Upper Nene catchment management plan : consultation report summary
560River Glen : river channel assessment : main report
561Dorset Stour : first annual review : January 1998 - December 1998
562Norfolk Broadland : Halvergate Marsh Erosion Protection Scheme : contract number 7, engineer's report
563Groundwater development scheme : Little Ouse and Thet catchment : control rules
564Investigation of final effluent flow at Fluxton STW
565Mersey sub-catchment report : February 1996
566Rising groundwater levels in the chalk-basal sands aquifer of the Central London Basin. Progress report, March 1995
567NRA baseline estuary and coastal waters monitoring programme
568Upper Bristol Avon catchment management : consultation report
569River Lynher catchment river water quality classification 1990
570Blythe/Cole/Bourne Catchment Management Plan Final Plan July 1994
571Discharge monitoring in the Kennet catchment. Part 1 : ecological effects of sewage and trade effluents
572Mesotrophic rivers in Anglian region : progress report 4 December 1995
573Biological characteristics and exploitation of sea trout in the River Tywi during 1989
574Delabole Stream (abandoned minewater) water quality investigation (total zinc)
575The Wandle, Beverley Brook, Hogsmill catchment management plan : consultation report summary : November 1994