| 451 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 452 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 453 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 454 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 455 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 456 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 457 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 458 | Contaminants entering the sea : a report on contaminant loads entering the seas around England and Wales 1990-1993 |
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| 459 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 460 | 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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| 461 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
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| 462 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
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| 463 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
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| 464 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 465 | The River Eden Demonstration Test Catchment (DTC) Data |
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| 466 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 467 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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| 468 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
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| 469 | Modelling phytoplankton development in the proposed Cardiff Bay Barrage
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| 470 | The evaluation of Grant/YSU 3800 water quality monitor |
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| 471 | PVC : an evaluation using the Natural Step framework |
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| 472 | Recommendations For The Processing And Presentation Of Groundwater Quality Data |
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| 473 | Quality audit of biological samples for the 1991 river quality survey |
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| 474 | Pesticides in the aquatic environment 1997 full report |
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| 475 | Quantification of the relationship between effluent quality and biological quality : final report |
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