| 401 | Development of the Acid Water Indicator Community (AWIC) Macroinvertebrate Family and Species Level |
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| 402 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 403 | The Impact Of Discarded Fishing Line And Tackle On Mute Swans - Phase 1 |
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| 404 | Effectiveness of eutrophication control by phosphorus reduction: development of the INCA-P model |
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| 405 | An investigation of the Madford River pollution incident of 29 July 1989 : November 1989 |
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| 406 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 407 | Time of travel study on the River Wandle under two different flow conditions |
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| 408 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 409 | Lower Lee fish mortalities associated with rainfall : including the event of 7/8th September 1993 |
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| 410 | Integrated river corridor assessment : a pilot study of the rivers Wansbeck and North Tyne in Northumbria |
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| 411 | River Teign corridor survey : prepared by Ecologue for the National Rivers Authority (South West Region) |
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| 412 | River Stort : draft catchment management plan for flood defence and the environment : May 1991 |
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| 413 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
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| 414 | The Blythe/Cole/Bourne catchment management plan : first annual review : July 1994 to July 1995 (NRA Severn-Trent 48)
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| 415 | Micro low flows average and low flows estimation in the SW region : validation of regional version 1.3 software |
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| 416 | Mercury and methylmercury in the river Yare, Norfolk (1986 - 1992) (OI/420/8/A annex) : annex to main report |
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| 417 | Investigation into failures of the River Dalch from Canns Mill Bridge to below Lapford sewage treatment works (2001) |
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| 418 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 419 | Micro low flows average and low flow estimation in the SW region : validation of version 1.2 software |
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| 420 | River Stour (2), Sudbury : report of a river corridor survey carried out for the National Rivers Authority, Anglian region |
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| 421 | River Wissey investigations : linking hydrology and ecology : the basis for in-river flow management. Final Draft (OI/526/ ) |
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| 422 | The Warwickshire Avon catchment management plan : first annual review : October 1994 - October 1995 (NRA Severn -Trent 45)
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| 423 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
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| 424 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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| 425 | Environmental assessment of Denver MRF : impact of freshwater flow on water quality of the Great Ouse estuary : draft working paper 3 |
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