| 401 | An investigation of the Madford River pollution incident of 29 July 1989 : November 1989 |
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| 402 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 403 | Time of travel study on the River Wandle under two different flow conditions |
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| 404 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 405 | Lower Lee fish mortalities associated with rainfall : including the event of 7/8th September 1993 |
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| 406 | Integrated river corridor assessment : a pilot study of the rivers Wansbeck and North Tyne in Northumbria |
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| 407 | River Teign corridor survey : prepared by Ecologue for the National Rivers Authority (South West Region) |
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| 408 | River Stort : draft catchment management plan for flood defence and the environment : May 1991 |
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| 409 | Impact assessment of scour valve test at Roadford Reservoir on water quality of the River Lyd |
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| 410 | The Blythe/Cole/Bourne catchment management plan : first annual review : July 1994 to July 1995 (NRA Severn-Trent 48)
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| 411 | Mercury and methylmercury in the river Yare, Norfolk (1986 - 1992) (OI/420/8/A annex) : annex to main report |
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| 412 | Audit of priority species of rivers and wetlands : riverine and wetland molluscs in South Hampshire and the Isle of Wight |
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| 413 | Audit of priority species of rivers and wetlands : kingfisher Alcedo atthis in South Hampshire and the Isle of Wight |
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| 414 | Audit of priority species of rivers and wetlands : Marsh Fritillary in South Hampshire and the Isle of Wight |
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| 415 | Audit of priority species of rivers and wetlands : Bittern Botaurus stellaris in South Hampshire and the Isle of Wight |
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| 416 | Audit of priority species of rivers and wetlands : white-clawed crayfish Austropotambius pallipes in South Hampshire and the Isle of Wight |
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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 | River Stour (2), Sudbury : report of a river corridor survey carried out for the National Rivers Authority, Anglian region |
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| 420 | River Wissey investigations : linking hydrology and ecology : the basis for in-river flow management. Final Draft (OI/526/ ) |
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| 421 | River Glen : river channel assessment : annex B : an analysis of invertebrate records for the River Glen 1976-1991 |
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| 422 | River Glen : river channel assessment : annex C : an assessment of low flow characteristics of the River Glen, Lincolnshire |
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| 423 | The Warwickshire Avon catchment management plan : first annual review : October 1994 - October 1995 (NRA Severn -Trent 45)
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| 424 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
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| 425 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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