| 401 | Water resources for the future : a summary of the strategy for Thames Region Summary |
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| 402 | Conservation and recreation: the Wye challenge: volume 1: report of the River Wye project |
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| 403 | A strategy for implementing the Environment Agency's contribution to the UK Biodiversity Action Plan |
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| 404 | SERPLAN development scenarios : the potential impact upon water resources in the SERPLAN region |
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| 405 | Towards the sustainable use of material resources : an evaluation using the natural step framework |
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| 406 | Water resources for the future : a summary of the strategy for Wales (bilingual) |
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| 407 | Water resources for the future : a summary of the strategy for North West Region |
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| 408 | Water resources for the future : a summary of the strategy for South West region |
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| 409 | Classification of listed substances for the purposes of the EC groundwater directive (80/68/EEC) : technical report |
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| 410 | Water for the future in Kent : NRA response to the issues and options report |
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| 411 | Review of flood defence practices on the Somerset Levels and Moors : the appendices |
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| 412 | Review of flood defence practices on the Somerset Levels and Moors : the report |
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| 413 | The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration |
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| 414 | Planning for the rising tides : the Humber estuary shoreline management plan. Summary of proposals |
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| 415 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 416 | The physical character of rivers and streams in the UK and Isle of Man |
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| 417 | The Distribution of Phytoplankton and Nutrients in the North East Irish Sea During 1998 |
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| 418 | The impact of industrial discharges on metal levels in biota of the West Cumbrian coast - 1990 |
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| 419 | Environmental monitoring of the Fal Estuary to support the Fal Swan study : final draft report |
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| 420 | The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment |
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| 421 | A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study |
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| 422 | A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989 |
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| 423 | A collation of the environmental impact work carried out following the Rosebay oil spill, May 1990 |
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| 424 | The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document |
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| 425 | An investigation into the effects of Alton sewage works on the River Wey North |
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