| 501 | Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991 |
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| 502 | River quality in England and Wales : a report of the 1990 survey |
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| 503 | Snapshots of the environment : understanding coastal water quality |
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| 504 | The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T) |
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| 505 | The evaluation of ingold ion selective ammonium electrode (220/23/T) |
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| 506 | Rivers of the Isle of Wight fact file |
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| 507 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 508 | The Mersey estuary : a report on environmental quality |
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| 509 | 'Sea Vigil' water quality monitoring : the East coast 1992-1993 |
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| 510 | The 1990 river and estuary classification survey of England and Wales |
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| 511 | The evaluation of an orion ammonium ion selective electrode (220/15/T) |
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| 512 | An Independent Review of the Defra/EA Research and Development Joint |
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| 513 | Anthropogenic Impacts on the Hydrology of Rivers and Lochs |
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| 514 | Dissemination of the Revitalised FEH Rainfall-runoff Method |
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| 515 | General guide to the prevention of water pollution |
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| 516 | Guidance on the use of Soil Screening Values for Ecological Risk Assessment |
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| 517 | Highway runoff: Effects of soluble pollutants on the ecology of receiving waters |
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| 518 | Life cycle assessment of disposable and reusable nappies in the UK |
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| 519 | Managing the social aspects of flooding: Synthesis Report |
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| 520 | National guidelines for the production of NRA regions 1990/91 regional plans |
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| 521 | Operational mechanisms for the protection and enhancement of headwaters |
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| 522 | Policy and practice for the protection of groundwater : regional appendix Welsh region |
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| 523 | Procurement legislation and the NRA : a brief guide |
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| 524 | Strategic review of development and flood risk : the River Welland catchment |
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| 525 | Strategic review of development and flood risk : the River Witham catchment |
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