| 501 | Clear Options towards an operational model for the Lee Valley Reservoirs |
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| 502 | The Cam catchment : recommendations for statutory water quality objectives |
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| 503 | Guidance for estimating the air quality impact of stationary sources - GN 24 |
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| 504 | Introductory guidance on the Agency's contribution to sustainable development (SD1) |
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| 505 | The National Centre for Toxic and Persistent Substances |
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| 506 | Algal blooms in the Lower Tees- Perspectives and prospects
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| 507 | Acidification of freshwaters: the threat and its mitigation |
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| 508 | Pearl Mussel Image: First out of the blocks |
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| 509 | FWR - User guide for assessing the impact of combined sewer overflows |
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| 510 | The groundwater regulations (Bilingual) : Rheoliadau dwr daear (Bilingual) |
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| 511 | The Use of Immuno Based Techniques for Chemical Analysis |
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| 512 | Water from the River Dee : a working partnership |
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| 513 | Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991 |
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| 514 | River quality in England and Wales : a report of the 1990 survey |
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| 515 | Snapshots of the environment : understanding coastal water quality |
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| 516 | The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T) |
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| 517 | The evaluation of ingold ion selective ammonium electrode (220/23/T) |
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| 518 | Rivers of the Isle of Wight fact file |
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| 519 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 520 | The Mersey estuary : a report on environmental quality |
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| 521 | Catches of migratory fish in the River Don, Aberdeenshire |
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| 522 | Stream survey and assessment in the Ashford and Folkestone areas |
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| 523 | Lakes, Ponds and Reservoirs in the Southern Region (NRA) |
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| 524 | The 1990 river and estuary classification survey of England and Wales |
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| 525 | The evaluation of an orion ammonium ion selective electrode (220/15/T) |
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