| 501 | Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134) |
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| 502 | A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake |
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| 503 | Health effects of sea bathing (WMI 9021) - Phase III final report to the Department of the Environment |
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| 504 | Procedure for quality assurance for RIVPACS compatible macro-invertebrate samples analysed to the taxonomic level needed for the BMWP-score system |
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| 505 | Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank |
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| 506 | 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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| 507 | 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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| 508 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 509 | Final report of the controlled cohort investigations into the health effects of bathing in sewage contaminated coastal waters |
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| 510 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 511 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 512 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 513 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 514 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 515 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 516 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 517 | 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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| 518 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 519 | 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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| 520 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
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| 521 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 522 | The River Eden Demonstration Test Catchment (DTC) Data |
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| 523 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 524 | The regulation of salmon angling in Great Britain
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| 525 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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