| 451 | Pesticides in the aquatic environment 1997 full report |
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| 452 | The precious resource : a brief guide to managing our water resources |
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| 453 | Quantification of the relationship between effluent quality and biological quality : final report |
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| 454 | Charging for discharges scheme : guidance to the agricultural industry |
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| 455 | Priority and other specific polluting substances and the Water Framework Directive |
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| 456 | 'Sea Vigil' water quality monitoring : the Humber estuary 1994 |
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| 457 | Evaluation of historical data on the nutrient status of Esthwaite Water, Cumbria
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| 458 | An Aerial Photograph of Ferry House and The Pearsall Building |
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| 459 | Review of existing practices for fluvial grass management throughout the NRA (213/1/Y) |
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| 460 | The interpretation of rod and net catch data |
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| 461 | Research and development in the Environment Agency : a short guide |
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| 462 | Problems with sea trout and salmon in the Western Highlands |
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| 463 | Clear Options towards an operational model for the Lee Valley Reservoirs |
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| 464 | Guidance for estimating the air quality impact of stationary sources - GN 24 |
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| 465 | Introductory guidance on the Agency's contribution to sustainable development (SD1) |
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| 466 | The National Centre for Toxic and Persistent Substances |
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| 467 | Acidification of freshwaters: the threat and its mitigation |
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| 468 | Pearl Mussel Image: First out of the blocks |
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| 469 | The National Centre for Environmental Data and Surveillance : general leaflet |
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| 470 | Project management and the scheme of delegation : a summary guide : April 1995 |
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| 471 | The groundwater regulations (Bilingual) : Rheoliadau dwr daear (Bilingual) |
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| 472 | The Use of Immuno Based Techniques for Chemical Analysis |
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| 473 | Snapshots of the environment : integrated river basin management |
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| 474 | Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991 |
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| 475 | River quality in England and Wales : a report of the 1990 survey |
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