| 251 | Attenuation of nitrate in the sub-surface environment |
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| 252 | Ecotoxicology : a report of the NRA R and D Ecotoxicology Group |
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| 253 | Guardians of the water environment (NRA Thames Region) |
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| 254 | Further Validation of PHABSIM for the Habitat Requirements of Salmonid Fish |
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| 255 | Instream Flow Requirements of the River Wissey, Norfolk, Annex C - April 1993
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| 256 | The Worcestershire Stour catchment : recommendations for statutory water quality objectives |
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| 257 | Dioxins and the River Doe Lea : plain English report |
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| 258 | Narrowboats on the Thames : useful hints and tips |
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| 259 | Locks and weirs on the river Thames : how do they work? |
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| 260 | Second annual review of the Lower Bristol Avon catchment management plan |
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| 261 | Second annual review of the Upper Bristol Avon catchment management plan |
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| 262 | The River Avon and its tributaries near Malmesbury : river management studies |
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| 263 | Pesticide residues in fish taken from the Newlyn River (1992) |
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| 264 | Environmental statement for the River Wandle flood alleviation scheme contract one (C1) |
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| 265 | Investigation of salinity in the river Thurne catchment of North East Norfolk |
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| 266 | Water quality investigations in the Newlyn river catchment |
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| 267 | The River Alt/Crossens fish stock assessment 2001 |
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| 268 | Investigations of discharges into the River Lemon at Newton Abbot |
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| 269 | Conservation and recreation : the Wye challenge : volume 2 : technical appendices |
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| 270 | The Ely Ouse catchment management plan : final plan : January 1994 |
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| 271 | Investigating the Applicability of Passive Sampling Devices to Pesticide Monitoring |
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| 272 | Water quality in Anglian Region : the first five years |
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| 273 | Monitoring of the Priory storm overflow on the River Tone at Taunton : June - November 1991 and water quality investigations unit January 1992 |
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| 274 | Water Quality and Freshwater Flow in the Thames Tideway in Relation to Salmon Migration, with particular reference to the effects of low flow in 1990 |
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| 275 | The quality of rivers and canals in England and Wales (1990 to 1992) : as assessed by a new general quality assessment scheme : report of the National Rivers Authority |
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