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551An investigation into the elevated BOD levels at Brocken Bridge (R30H001) on the Barnstaple Yeo [DEV/E/20/95]
552An investigation to determine if Great Torrington STW is the cause of elevated copper and zinc concentrations in the River Torridge
553Options for development of an enhanced team culture in the NRA, using the Welsh Regional Technical Department as an example
554A preliminary investigation into the extent of saline ingress into Curry Moor from the River Tone, January 1994
555Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134)
556A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake
557Procedure for quality assurance for RIVPACS compatible macro-invertebrate samples analysed to the taxonomic level needed for the BMWP-score system
558Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank
559The Economics of No-Spray Zones - a Study of the Risks and Benefits of Pesticide No-Spray Restrictions
560An audit of performance in the AQC inspection of standard biological macro-invertebrate samples in 2002 : The Environment Agency (C00158/31)
561Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph
562Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991
563An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989
564An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley
565River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man
566Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation
567Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA
568An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991)
569Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests
570An investigation into the frequency of discharge of three combined sewer overflows in the Afan/Kenfig catchment : TM/EAW/96/06
571NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group
572Options for transfer of water from the River Trent and reservoir storage at Great Bradley : technical summary of the feasibility report
573Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922
574The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England;
575PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps