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526An Assessment of Cormorant Depredation on Stillwater Coarse Fish Populations in the Lea and Colne Valleys of the Thames Catchment
527Water framework directive : guiding principles on the technical requirements (summary) : accompanying summary to the Environment Agency consultation document
528A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89
529An investigation into the elevated BOD levels at Brocken Bridge (R30H001) on the Barnstaple Yeo [DEV/E/20/95]
530Options for development of an enhanced team culture in the NRA, using the Welsh Regional Technical Department as an example
531A preliminary investigation into the extent of saline ingress into Curry Moor from the River Tone, January 1994
532Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134)
533A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake
534Procedure for quality assurance for RIVPACS compatible macro-invertebrate samples analysed to the taxonomic level needed for the BMWP-score system
535Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank
536The Economics of No-Spray Zones - a Study of the Risks and Benefits of Pesticide No-Spray Restrictions
537An audit of performance in the AQC inspection of standard biological macro-invertebrate samples in 2002 : The Environment Agency (C00158/31)
538Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph
539Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991
540An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989
541Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation
542Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA
543An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991)
544Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests
545NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group
546Options for transfer of water from the River Trent and reservoir storage at Great Bradley : technical summary of the feasibility report
547Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922
548The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England;
549PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps
550POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS