| 501 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 502 | The Mersey estuary : a report on environmental quality |
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| 503 | Catches of migratory fish in the River Don, Aberdeenshire |
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| 504 | Stream survey and assessment in the Ashford and Folkestone areas |
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| 505 | Lakes, Ponds and Reservoirs in the Southern Region (NRA) |
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| 506 | The 1990 river and estuary classification survey of England and Wales |
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| 507 | The evaluation of an orion ammonium ion selective electrode (220/15/T) |
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| 508 | An Independent Review of the Defra/EA Research and Development Joint |
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| 509 | Anthropogenic Impacts on the Hydrology of Rivers and Lochs |
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| 510 | Dissemination of the Revitalised FEH Rainfall-runoff Method |
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| 511 | General guide to the prevention of water pollution |
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| 512 | Guidance on the use of Soil Screening Values for Ecological Risk Assessment |
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| 513 | Highway runoff: Effects of soluble pollutants on the ecology of receiving waters |
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| 514 | Life cycle assessment of disposable and reusable nappies in the UK |
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| 515 | Managing the social aspects of flooding: Synthesis Report |
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| 516 | National guidelines for the production of NRA regions 1990/91 regional plans |
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| 517 | Operational mechanisms for the protection and enhancement of headwaters |
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| 518 | Policy and practice for the protection of groundwater : regional appendix Welsh region |
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| 519 | Procurement legislation and the NRA : a brief guide |
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| 520 | Survey of copper speciation in the Great Ouse estuary |
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| 521 | Sustainable development indicators : monitoring change in the East Midlands |
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| 522 | Technical Support Materials for the Regulation of Radioactively Contaminated Land |
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| 523 | The impact of climate change on severe droughts: Implications for decision making |
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| 524 | The Impact of Grazing and Upland Management on Erosion and Runoff |
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| 525 | The Potential For Generating Hydro-Electricity From Weirs |
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