| 276 | Conservation and recreation: the Wye challenge: volume 1: report of the River Wye project |
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| 277 | Towards the sustainable use of material resources : an evaluation using the natural step framework |
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| 278 | Water resources for the future : a summary of the strategy for Wales (bilingual) |
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| 279 | Classification of listed substances for the purposes of the EC groundwater directive (80/68/EEC) : technical report |
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| 280 | Water for the future in Kent : NRA response to the issues and options report |
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| 281 | Estuarine fish survey 1989 : inferences on the pollution status of the Thames estuary |
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| 282 | The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration |
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| 283 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 284 | The influence of agriculture on the quality of natural waters in England and Wales |
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| 285 | The physical character of rivers and streams in the UK and Isle of Man |
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| 286 | The Distribution of Phytoplankton and Nutrients in the North East Irish Sea During 1998 |
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| 287 | Biological assessment of the effects of Ivybridge Sewage Treatment Works on the River Erme |
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| 288 | The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment |
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| 289 | The behaviour of atrazine and simazine within the chalk aquifer : experimental results and interpretation |
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| 290 | A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study |
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| 291 | A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989 |
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| 292 | The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document |
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| 293 | An investigation into the effects of Alton sewage works on the River Wey North |
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| 294 | Investigation into the impact of Henstridge sewage treatment works on the River Umber, North Devon |
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| 295 | A brief history of the River Stour navigation : 1705 to the present day |
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| 296 | The Investigation and Specification of Flow Measurement Structure Design Features that Aid the Migration of Fish |
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| 297 | Discharges of waste under the EC titanium dioxide directives : report of the National Rivers Authority |
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| 298 | The land-use planning system and the Water Framework Directive (can't read barcode) |
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| 299 | The Natural (Baseline) Quality Of Groundwaters In England And Wales - The Culm Aquifers, SW England; |
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| 300 | Rural sewage pollution in the '90s : report of the rural sewerage project 1993/4 |
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