| 451 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 452 | Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority |
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| 453 | Manual for the use of herbicides in or near water : January 1993 : final draft report |
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| 454 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 455 | Report on the By Brook low flow investigations : October 2001 : volume 1 : report |
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| 456 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 457 | The development of a portable battery-powered telemetry system for use in water quality investigations |
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| 458 | Impact assessment of Meldon quarry on water quality in the West Okement river |
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| 459 | River Meavy salmon and sea trout populations : assessment of the impact of flows |
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| 460 | The effect of ferric dosing of lakes on benthic invertebrates : first year report |
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| 461 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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| 462 | The distribution of PCDDS and PCDFS in surface freshwater systems 2nd Interim Progress Report - February 1993 |
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| 463 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 464 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 465 | Use Of Pattern Recognition To Identify The Source Of An Oil Spill On An Inland Water |
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| 466 | Effects of suspended solids on salmon (Salmo salar, L.) in the Parrett stuary, Somerset, Draft |
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| 467 | Two year aesthetic survey of beaches in the South West (1990 and 1991) |
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| 468 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 469 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 470 | Guidance on the Development of Typology and Classification Systems for Transitional and Coastal Waters |
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| 471 | Technical basis for the predicted impacts of relocating Redgrave abstraction to Borehole B |
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| 472 | River Wissey investigations : linking hydrology and ecology : summary of a recommendations for the River Wissey (OI/526) |
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| 473 | Investigation of tecnazene contamination in the Chyandour Brook west Cornwall during spring 1990 |
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| 474 | Environmental impact assessment in relation to water resources authorisations : guidance on the requirements and procedures |
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| 475 | Groundwater management in the North West: efficiency review and business plan: certificate in management |
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