| 401 | Integrated river corridor assessment : a pilot study of the rivers Wansbeck and North Tyne in Northumbria |
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| 402 | River Teign corridor survey : prepared by Ecologue for the National Rivers Authority (South West Region) |
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| 403 | River Stort : draft catchment management plan for flood defence and the environment : May 1991 |
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| 404 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
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| 405 | Impact assessment of scour valve test at Roadford Reservoir on water quality of the River Lyd |
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| 406 | Micro low flows average and low flows estimation in the SW region : validation of regional version 1.3 software |
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| 407 | Mercury and methylmercury in the river Yare, Norfolk (1986 - 1992) (OI/420/8/A annex) : annex to main report |
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| 408 | Audit of priority species of rivers and wetlands : riverine and wetland molluscs in South Hampshire and the Isle of Wight |
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| 409 | Audit of priority species of rivers and wetlands : kingfisher Alcedo atthis in South Hampshire and the Isle of Wight |
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| 410 | Audit of priority species of rivers and wetlands : Marsh Fritillary in South Hampshire and the Isle of Wight |
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| 411 | Audit of priority species of rivers and wetlands : Bittern Botaurus stellaris in South Hampshire and the Isle of Wight |
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| 412 | 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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| 413 | Investigation into failures of the River Dalch from Canns Mill Bridge to below Lapford sewage treatment works (2001) |
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| 414 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 415 | Micro low flows average and low flow estimation in the SW region : validation of version 1.2 software |
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| 416 | River Stour (2), Sudbury : report of a river corridor survey carried out for the National Rivers Authority, Anglian region |
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| 417 | River Wissey investigations : linking hydrology and ecology : the basis for in-river flow management. Final Draft (OI/526/ ) |
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| 418 | River Glen : river channel assessment : annex B : an analysis of invertebrate records for the River Glen 1976-1991 |
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| 419 | River Glen : river channel assessment : annex C : an assessment of low flow characteristics of the River Glen, Lincolnshire |
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| 420 | The Warwickshire Avon catchment management plan : first annual review : October 1994 - October 1995 (NRA Severn -Trent 45)
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| 421 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
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| 422 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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| 423 | 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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| 424 | Micro low flows average and low flows estimation in the SW region : validation of regional version 1.1 software |
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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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