| 501 | Impact assessment of Helston Sewage Treatment Works on water quality of the River Cober Loe Pool |
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| 502 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : AQC audit |
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| 503 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : primary audit |
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| 504 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk B |
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| 505 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 506 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 507 | The Warwickshire Avon catchment management plan : consultation report summary (NRA Severn-Trent 44) |
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| 508 | Policy and practice for the protection of groundwater : North West region : 2nd edition, 1995 |
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| 509 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 510 | The Somerset Levels and Moors : water level management and nature conservation : consultation paper |
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| 511 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
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| 512 | Land use practices and pathways of pesticide residues in the Mount's Bay catchment, Cornwall |
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| 513 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 514 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 515 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 516 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 517 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 518 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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| 519 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 520 | Nutrient export modelling on the River Bure, Norfolk : progress report 2 : June-July 1995 |
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| 521 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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| 522 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 523 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
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| 524 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 525 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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