| 476 | The National Centre for Toxic and Persistent Substances |
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| 477 | Algal blooms in the Lower Tees- Perspectives and prospects
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| 478 | Acidification of freshwaters: the threat and its mitigation |
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| 479 | Pearl Mussel Image: First out of the blocks |
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| 480 | The groundwater regulations (Bilingual) : Rheoliadau dwr daear (Bilingual) |
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| 481 | The Use of Immuno Based Techniques for Chemical Analysis |
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| 482 | Water from the River Dee : a working partnership |
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| 483 | Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991 |
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| 484 | River quality in England and Wales : a report of the 1990 survey |
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| 485 | Snapshots of the environment : understanding coastal water quality |
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| 486 | The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T) |
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| 487 | The evaluation of ingold ion selective ammonium electrode (220/23/T) |
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| 488 | Rivers of the Isle of Wight fact file |
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| 489 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 490 | Catches of migratory fish in the River Don, Aberdeenshire |
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| 491 | Stream survey and assessment in the Ashford and Folkestone areas |
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| 492 | Lakes, Ponds and Reservoirs in the Southern Region (NRA) |
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| 493 | The 1990 river and estuary classification survey of England and Wales |
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| 494 | The evaluation of an orion ammonium ion selective electrode (220/15/T) |
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| 495 | An Independent Review of the Defra/EA Research and Development Joint |
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| 496 | Anthropogenic Impacts on the Hydrology of Rivers and Lochs |
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| 497 | Dissemination of the Revitalised FEH Rainfall-runoff Method |
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| 498 | General guide to the prevention of water pollution |
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| 499 | Guidance on the use of Soil Screening Values for Ecological Risk Assessment |
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| 500 | Highway runoff: Effects of soluble pollutants on the ecology of receiving waters |
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