| 501 | Algae or sewage? : helping you tell the difference |
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| 502 | Economic changes to the value of water environment : draft final report |
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| 503 | NRA superannuation report and accounts for the period ended 31 March 1990 |
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| 504 | Wash zone report. Part 1 : the Wash NRA monitoring review |
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| 505 | Computer files used in the calculation of Rutland and Grafham yields |
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| 506 | The control of effluent discharges by a direct toxicity assessment (DTA) approach |
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| 507 | The Restoration of Floodplain Woodlands in Lowland Britain |
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| 508 | Take to the water : a beginner's guide to boating on inland waterways |
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| 509 | Report on the quality of bathing waters 1990 |
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| 510 | Guidance on the Assessment of Cause and Effect in Ecological Risk Assessment |
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| 511 | Wetlands for Wales : a strategy for the third millenium |
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| 512 | Protecting and improving the water environment : model policies |
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| 513 | The Impacts of flooding on urban and rural communities |
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| 514 | The relationship between turbidity and suspended solids in final effluents |
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| 515 | General guide to the prevention of pollution of controlled water |
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| 516 | The Environmental Impact of Fish Farming - A Review |
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| 517 | The evaluation of an hydrolab DS3 submersible water quality monitor |
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| 518 | Sustaining our resources : the way forward : summary document |
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| 519 | The Removal of Technetium from EARP Waste Streams, Phase II |
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| 520 | Benchmarking rainfall runoff models within the Anglian Region : final report |
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| 521 | Cross border river basin districts and the Water Framework Directive |
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| 522 | The Occurrence of Sheep Dip Pesticides in Environmental Waters June 1997 |
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| 523 | Evaluation of AN analytical sensors ammonium probe for the grant\YSI 3800 |
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| 524 | 'Sea Vigil' water quality monitoring : the Humber estuary 1992-1993 |
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| 525 | Historic changes in the Upper River Ehen Catchment- Summary |
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