| 501 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 502 | 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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| 503 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
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| 504 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
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| 505 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
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| 506 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
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| 507 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |
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| 508 | The Evaluation of Acoustic Doppler Current Profiler Equipment |
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| 509 | Modelling phytoplankton development in the proposed Cardiff Bay Barrage
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| 510 | Dead zones, live markers: the biological environments of larger U.K. Rivers
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| 511 | The Impact Of Particulate Outputs Associated With Timber Harvesting |
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| 512 | The evaluation of Grant/YSU 3800 water quality monitor |
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| 513 | PVC : an evaluation using the Natural Step framework |
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| 514 | Recommendations For The Processing And Presentation Of Groundwater Quality Data |
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| 515 | Landfill and the water environment : NRA position statement |
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| 516 | The vision for our environment : making it happen |
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| 517 | Environment Agency guidance on the conditioning of intermediate level waste |
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| 518 | Quality audit of biological samples for the 1991 river quality survey |
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| 519 | Pesticides in the aquatic environment 1997 full report |
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| 520 | The precious resource : a brief guide to managing our water resources |
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| 521 | Charging for discharges scheme : guidance to the agricultural industry |
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| 522 | Priority and other specific polluting substances and the Water Framework Directive |
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| 523 | 'Sea Vigil' water quality monitoring : the Humber estuary 1994 |
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| 524 | Evaluation of historical data on the nutrient status of Esthwaite Water, Cumbria
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| 525 | An Aerial Photograph of Ferry House and The Pearsall Building |
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