| 501 | Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank |
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| 502 | The Economics of No-Spray Zones - a Study of the Risks and Benefits of Pesticide No-Spray Restrictions |
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| 503 | An audit of performance in the AQC inspection of standard biological macro-invertebrate samples in 2002 : The Environment Agency (C00158/31) |
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| 504 | Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph |
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| 505 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 506 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 507 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
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| 508 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 509 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 510 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 511 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 512 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 513 | An investigation into the frequency of discharge of three combined sewer overflows in the Afan/Kenfig catchment : TM/EAW/96/06 |
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| 514 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 515 | Options for transfer of water from the River Trent and reservoir storage at Great Bradley : technical summary of the feasibility report |
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| 516 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
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| 517 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
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| 518 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
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| 519 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 520 | The River Eden Demonstration Test Catchment (DTC) Data |
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| 521 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 522 | Environmental snapshot for the East of England [version 1] |
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| 523 | The regulation of salmon angling in Great Britain
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| 524 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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| 525 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
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