| 326 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 327 | Investigation into the frequency of storm overflow operation at Bradworthy sewage treatment works (1996) |
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| 328 | Microbiological examination of coastal waters in the North West : summary of results 1998 |
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| 329 | Regulation of dioxin releases from the Runcorn operations of ICI and EVC |
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| 330 | National marine baseline survey 1995 : littoral cell 8 : Severn Estuary to St David's Head |
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| 331 | Pearson's and Scotman's flashes : a review of water quality 1996 to 1999 |
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| 332 | Pollution incidents report - 1997 Midlands region |
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| 333 | River Deben alleviation of low flows scheme : an environmental appraisal. Final report |
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| 334 | River water quality 1992 classification by determinand : environmental protection draft final report |
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| 335 | Investigation of mercury contamination in the Red River catchment, West Cornwall |
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| 336 | River Looe catchment river water quality classification 1990 |
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| 337 | Water quality investigations at Nancekuke, Cornwall |
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| 338 | River Tamar EC dangerous substance directive failure 1993 : final draft report |
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| 339 | Routine monitoring of river water quality : sampling and analysis schedule |
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| 340 | Roadford operational and environmental study : draft final report : Volume 5 : annex G monitoring, annex H reservior operating agreement |
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| 341 | Regional water quality monitoring and surveillance programme for 1993 : quality investigations in controlled waters : final draft report |
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| 342 | River Otter : environmental data review. Volume 2 : text : River Otter environmental study 1993/94 |
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| 343 | River Otter : environmental data review. Volume 4 : appendices : River Otter environmental study 1993/94 |
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| 344 | 1990 classification of estuary quality |
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| 345 | East Looe river : river ecosystem (RE) non-compliance investigation : final draft report |
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| 346 | River Dart catchment river water quality classification 1990 |
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| 347 | River quality : July 1990 - June 1991 |
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| 348 | River Gannel catchment river water quality classification 1991 |
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| 349 | Determination of Metal Background Reference Concentrations: Feasibility Study |
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| 350 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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