476 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
477 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
478 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
479 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
480 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
481 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
482 | Contaminants entering the sea : a report on contaminant loads entering the seas around England and Wales 1990-1993 |
483 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
484 | Options for transfer of water from the River Trent and reservoir storage at Great Bradley : technical summary of the feasibility report |
485 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
486 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
487 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
488 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
489 | The River Eden Demonstration Test Catchment (DTC) Data |
490 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
491 | The regulation of salmon angling in Great Britain
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492 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
493 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
494 | Modelling phytoplankton development in the proposed Cardiff Bay Barrage
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495 | Dead zones, live markers: the biological environments of larger U.K. Rivers
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496 | The Impact Of Particulate Outputs Associated With Timber Harvesting |
497 | The evaluation of Grant/YSU 3800 water quality monitor |
498 | PVC : an evaluation using the Natural Step framework |
499 | Recommendations For The Processing And Presentation Of Groundwater Quality Data |
500 | Landfill and the water environment : NRA position statement |