| 451 | Water resources for the future : a summary of the strategy for South West region |
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| 452 | Classification of listed substances for the purposes of the EC groundwater directive (80/68/EEC) : technical report |
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| 453 | Running with the tide : reconciling development pressures with flood risk and the environment |
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| 454 | Water for the future in Kent : NRA response to the issues and options report |
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| 455 | Review of flood defence practices on the Somerset Levels and Moors : the appendices |
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| 456 | Review of flood defence practices on the Somerset Levels and Moors : the report |
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| 457 | Estuarine fish survey 1989 : inferences on the pollution status of the Thames estuary |
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| 458 | Investigation of the water quality in the Buckland stream up and downstream of East/West Buckland |
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| 459 | The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration |
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| 460 | Planning for the rising tides : the Humber estuary shoreline management plan. Summary of proposals |
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| 461 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 462 | The influence of agriculture on the quality of natural waters in England and Wales |
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| 463 | The physical character of rivers and streams in the UK and Isle of Man |
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| 464 | The Distribution of Phytoplankton and Nutrients in the North East Irish Sea During 1998 |
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| 465 | The impact of industrial discharges on metal levels in biota of the West Cumbrian coast - 1990 |
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| 466 | The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment |
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| 467 | The behaviour of atrazine and simazine within the chalk aquifer : experimental results and interpretation |
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| 468 | A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study |
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| 469 | A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989 |
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| 470 | The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document |
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| 471 | An investigation into the effects of Alton sewage works on the River Wey North |
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| 472 | Investigation into the impact of Henstridge sewage treatment works on the River Umber, North Devon |
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| 473 | A brief history of the River Stour navigation : 1705 to the present day |
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| 474 | The Investigation and Specification of Flow Measurement Structure Design Features that Aid the Migration of Fish |
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| 475 | Discharges of waste under the EC titanium dioxide directives : report of the National Rivers Authority |
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