| 526 | 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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| 527 | Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank |
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| 528 | The Economics of No-Spray Zones - a Study of the Risks and Benefits of Pesticide No-Spray Restrictions |
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| 529 | 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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| 530 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 531 | Final report of the controlled cohort investigations into the health effects of bathing in sewage contaminated coastal waters |
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| 532 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 533 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
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| 534 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 535 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 536 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 537 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 538 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 539 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 540 | 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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| 541 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
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| 542 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
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| 543 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
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| 544 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 545 | The River Eden Demonstration Test Catchment (DTC) Data |
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| 546 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 547 | Environmental snapshot for the East of England [version 1] |
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| 548 | The regulation of salmon angling in Great Britain
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| 549 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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| 550 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
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