| 551 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
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| 552 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
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| 553 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 554 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 555 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 556 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 557 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 558 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 559 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
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| 560 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 561 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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| 562 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 563 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
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| 564 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 565 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
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| 566 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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| 567 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
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| 568 | An investigation of the Madford River pollution incident of 29 July 1989 : November 1989 |
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| 569 | Devon area internal report - measurement of dissolved oxygen levels in the Dart estuary - March 1996 |
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| 570 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 571 | The Natural (Baseline) Quality of Groundwaters in England and Wales - Magnesium Limestone of Yorkshire and Northumbria |
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| 572 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 573 | Analysis of bacteriological contamination and accumulation of metals and organics in the mussel (Mytilus edulis) |
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| 574 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 575 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
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