| 401 | Conservation and recreation: the Wye challenge: volume 1: report of the River Wye project |
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| 402 | Towards the sustainable use of material resources : an evaluation using the natural step framework |
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| 403 | Water resources for the future : a summary of the strategy for Wales (bilingual) |
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| 404 | Water resources for the future : a summary of the strategy for North West Region |
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| 405 | Water resources for the future : a summary of the strategy for South West region |
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| 406 | Classification of listed substances for the purposes of the EC groundwater directive (80/68/EEC) : technical report |
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| 407 | Running with the tide : reconciling development pressures with flood risk and the environment |
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| 408 | Water for the future in Kent : NRA response to the issues and options report |
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| 409 | Review of flood defence practices on the Somerset Levels and Moors : the appendices |
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| 410 | Review of flood defence practices on the Somerset Levels and Moors : the report |
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| 411 | Estuarine fish survey 1989 : inferences on the pollution status of the Thames estuary |
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| 412 | The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration |
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| 413 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 414 | The influence of agriculture on the quality of natural waters in England and Wales |
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| 415 | The physical character of rivers and streams in the UK and Isle of Man |
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| 416 | Biological assessment of the effects of Ivybridge Sewage Treatment Works on the River Erme |
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| 417 | Environmental monitoring of the Fal Estuary to support the Fal Swan study : final draft report |
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| 418 | The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment |
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| 419 | The behaviour of atrazine and simazine within the chalk aquifer : experimental results and interpretation |
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| 420 | A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study |
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| 421 | A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989 |
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| 422 | The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document |
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| 423 | An investigation into the effects of Alton sewage works on the River Wey North |
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| 424 | Investigation into the impact of Henstridge sewage treatment works on the River Umber, North Devon |
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| 425 | A brief history of the River Stour navigation : 1705 to the present day |
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