| 251 | Review of Lake Benthic Macro-invertebrate Sampling Methods and Strategy for the Water Framework Directive |
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| 252 | NRA programme for the monitoring of water quality Parts 1 to 3 - November 1994 |
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| 253 | National marine baseline survey 1995 : littoral cell 7 : Lands End to the Severn Estuary |
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| 254 | A Proposed Scheme To Ensure The Quality Of Data Generated By Laboratories Undertaking Regulatory Ecotoxicological Testing |
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| 255 | Proceedings of the conference National Minewaters 20th -21st April 1998 Tapton Hall Sheffield University |
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| 256 | National marine baseline survey 1995 : littoral cell 4 : the Thames to Selsey Bill |
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| 257 | Distribution of Macroinvertebrates in English and Welsh Rivers based on the 1995 Survey |
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| 258 | The disposal of sheep dip waste (R and D Report 11) : effects on water quality |
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| 259 | Quantification of the relationship between effluent quality and biological quality : interim report for stage 1 |
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| 260 | Bathing water quality in England and Wales in 1995 : report of the National Rivers Authority |
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| 261 | Devon area internal report - further investigations into pipe discharges in the Lower Teign estuary |
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| 262 | A report on water quality issues within the Midford Brook catchment - June 1996 |
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| 263 | National marine baseline survey 1995 : littoral cell 11 : Great Orme to the Solway Firth |
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| 264 | Investigation into the frequency of storm overflow operation at Bradworthy sewage treatment works (1996) |
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| 265 | Microbiological examination of coastal waters in the North West : summary of results 1998 |
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| 266 | Report on the By Brook low flow investigations : October 2001 : volume 2 : (figures, maps and appendices) |
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| 267 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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| 268 | The Wandle, Beverley Brook, Hogsmill catchment management plan : consultation report summary : November 1994 |
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| 269 | A study to investigate and propose remedies for river quality problems in the Madford catchment |
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| 270 | Regional river quality monitoring and surveillance : results of the 1990/1991 biological survey : draft report |
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| 271 | Water pollution incidents in England and Wales - 1990 : report of the National Rivers Authority |
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| 272 | Two year aesthetic survey of beaches in the South West (1990 and 1991) |
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| 273 | The Influence of Variations in Flow on General Quality Assessment of Rivers - Summary Document |
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| 274 | Annual classification of river water quality 1992 : numbers of samples exceeding the quality standard |
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| 275 | Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority |
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