| 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 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
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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 | The regulation of salmon angling in Great Britain
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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 | PVC : an evaluation using the Natural Step framework |
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| 512 | Landfill and the water environment : NRA position statement |
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| 513 | The vision for our environment : making it happen |
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| 514 | Environment Agency guidance on the conditioning of intermediate level waste |
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| 515 | Pesticides in the aquatic environment 1997 full report |
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| 516 | The precious resource : a brief guide to managing our water resources |
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| 517 | Charging for discharges scheme : guidance to the agricultural industry |
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| 518 | Priority and other specific polluting substances and the Water Framework Directive |
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| 519 | Evaluation of historical data on the nutrient status of Esthwaite Water, Cumbria
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| 520 | An Aerial Photograph of Ferry House and The Pearsall Building |
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| 521 | Review of existing practices for fluvial grass management throughout the NRA (213/1/Y) |
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| 522 | The interpretation of rod and net catch data |
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| 523 | Research and development in the Environment Agency : a short guide |
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| 524 | Problems with sea trout and salmon in the Western Highlands |
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| 525 | Clear Options towards an operational model for the Lee Valley Reservoirs |
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