| 551 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : AQC audit |
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| 552 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : primary audit |
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| 553 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : AQC audit |
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| 554 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : primary audit |
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| 555 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk B |
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| 556 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 557 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 558 | The Warwickshire Avon catchment management plan : consultation report summary (NRA Severn-Trent 44) |
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| 559 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 560 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
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| 561 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
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| 562 | Land use practices and pathways of pesticide residues in the Mount's Bay catchment, Cornwall |
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| 563 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 564 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 565 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 566 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 567 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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| 568 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 569 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
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| 570 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 571 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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| 572 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
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| 573 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 574 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
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| 575 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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