| 551 | Future water resources in the Thames Region : a strategy for sustainable management. June 1994 |
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| 552 | Groundwater management in the North West: efficiency review and business plan: certificate in management |
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| 553 | Environmental impact assessment in relation to water resources authorisations : guidance on the requirements and procedures |
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| 554 | Impact assessment of Helston Sewage Treatment Works on water quality of the River Cober Loe Pool |
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| 555 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : AQC audit |
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| 556 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : primary audit |
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| 557 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : AQC audit |
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| 558 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : primary audit |
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| 559 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk B |
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| 560 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 561 | The Warwickshire Avon catchment management plan : consultation report summary (NRA Severn-Trent 44) |
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| 562 | Policy and practice for the protection of groundwater : North West region : 2nd edition, 1995 |
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| 563 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 564 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
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| 565 | Land use practices and pathways of pesticide residues in the Mount's Bay catchment, Cornwall |
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| 566 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 567 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 568 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 569 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 570 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 571 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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| 572 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 573 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
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| 574 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 575 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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