526 | An assessment of mercury contamination in the Red River catchment : final draft report |
527 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
528 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
529 | Land use practices and pathways of pesticide residues in the Mount's Bay catchment, Cornwall |
530 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
531 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
532 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
533 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
534 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
535 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
536 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
537 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
538 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
539 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
540 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
541 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
542 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
543 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
544 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
545 | The Natural (Baseline) Quality of Groundwaters in England and Wales - Magnesium Limestone of Yorkshire and Northumbria |
546 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
547 | Analysis of bacteriological contamination and accumulation of metals and organics in the mussel (Mytilus edulis) |
548 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
549 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
550 | Impact assessment of scour valve test at Roadford Reservoir on water quality of the River Lyd |