| 526 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 527 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
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| 528 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 529 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 530 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 531 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 532 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 533 | 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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| 534 | Contaminants entering the sea : a report on contaminant loads entering the seas around England and Wales 1990-1993 |
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| 535 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 536 | 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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| 537 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
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| 538 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
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| 539 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 540 | The River Eden Demonstration Test Catchment (DTC) Data |
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| 541 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 542 | Environmental snapshot for the East of England [version 1] |
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| 543 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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| 544 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
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| 545 | Modelling phytoplankton development in the proposed Cardiff Bay Barrage
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| 546 | The Impact Of Particulate Outputs Associated With Timber Harvesting |
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| 547 | The evaluation of Grant/YSU 3800 water quality monitor |
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| 548 | PVC : an evaluation using the Natural Step framework |
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| 549 | Recommendations For The Processing And Presentation Of Groundwater Quality Data |
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| 550 | Landfill and the water environment : NRA position statement |
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