| 501 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 502 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
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| 503 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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| 504 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
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| 505 | Devon area internal report - measurement of dissolved oxygen levels in the Dart estuary - March 1996 |
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| 506 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 507 | The Natural (Baseline) Quality of Groundwaters in England and Wales - Magnesium Limestone of Yorkshire and Northumbria |
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| 508 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 509 | Analysis of bacteriological contamination and accumulation of metals and organics in the mussel (Mytilus edulis) |
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| 510 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 511 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
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| 512 | Impact assessment of scour valve test at Roadford Reservoir on water quality of the River Lyd |
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| 513 | A review of the hydrogeological information for the Thompson and Merton areas, Norfolk : including predictions of the impact of nearby chalk water abstractions on water levels at Thompson Water, Carr and Common SSSI and candidate SAC |
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| 514 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period April 1984- March 1988
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| 515 | An investigation into the presence of high levels of cadmium in sea-water samples from Mounts Bay, Cornwall |
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| 516 | Water quality modelling in the Environment Agency (Report no.28) : present practice and future challenges : Water Quality Modelling Group workshop proceedings |
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| 517 | Local Environment Agency plan for the West Midlands Tame, 2nd annual review, July 2001 : local environment focus |
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| 518 | The use of constructed wetlands to ameliorate metal-rich mine waters. Stage 1 : study of natural wetlands |
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| 519 | NRA guidance on the acceptable leachable values for contaminated material to be deposited in Upper Tame catchment |
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| 520 | Further monitoring of the impact of Crown Dale waste water treatment works final effluent on water quality |
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| 521 | The Blythe/Cole/Bourne catchment management plan : first annual review : July 1994 to July 1995 (NRA Severn-Trent 48)
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| 522 | The FBA-Welsh Water simulation model of phytoplankton dynamics in flushed systems. Authentication in a coastal lagoon |
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| 523 | Investigating the effect of changing retention time in natural and artificial water bodies: Simulations using PROTECH-D |
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| 524 | Progress in water supply planning : the Environment Agency's review of water company water resources plans : a submission to Government |
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| 525 | Evaluating the impact of groundwater abstraction on key conservation sites, final report : Yare Broads and marshes (Strumpshaw Fen) |
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