| 526 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : primary audit |
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| 527 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk B |
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| 528 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 529 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 530 | The Warwickshire Avon catchment management plan : consultation report summary (NRA Severn-Trent 44) |
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| 531 | Policy and practice for the protection of groundwater : North West region : 2nd edition, 1995 |
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| 532 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 533 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
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| 534 | Land use practices and pathways of pesticide residues in the Mount's Bay catchment, Cornwall |
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| 535 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 536 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 537 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 538 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 539 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 540 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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| 541 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
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| 542 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 543 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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| 544 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 545 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
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| 546 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 547 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
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| 548 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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| 549 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
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| 550 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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