| 526 | Applications Of Artificial Intelligence For The Biological Surveillance Of River Quality |
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| 527 | Improving the contribution of social science to Flood Risk Management |
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| 528 | Reappraisal of the River Lee to Wheathampstead Mill |
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| 529 | Business requirement specification : integrated accounting system for the (IAS) |
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| 530 | A report on fish production in the National Rivers Authority |
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| 531 | Moston Brook Summary Report for the Evidence and Measures Project |
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| 532 | Corporate Environmental Reporting in the UK Water Sector - A Concise Review |
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| 533 | Strategy for the use of field instrumentation in water quality monitoring |
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| 534 | User notes for the Deben groundwater modelling package |
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| 535 | Anthropogenic Influences on the temperature regime in a chalk river |
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| 536 | Water and the environment in times of drought |
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| 537 | Water and the environment in times of drought |
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| 538 | A strategy for the management of salmon in England and Wales |
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| 539 | Algae or sewage? : helping you tell the difference |
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| 540 | Economic changes to the value of water environment : draft final report |
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| 541 | NRA superannuation report and accounts for the period ended 31 March 1990 |
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| 542 | Wash zone report. Part 1 : the Wash NRA monitoring review |
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| 543 | The Cam catchment, Anglian region : proposals for statutory water quality objectives |
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| 544 | Computer files used in the calculation of Rutland and Grafham yields |
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| 545 | The Restoration of Floodplain Woodlands in Lowland Britain |
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| 546 | Take to the water : a beginner's guide to boating on inland waterways |
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| 547 | Report on the quality of bathing waters 1990 |
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| 548 | Guidance on the Assessment of Cause and Effect in Ecological Risk Assessment |
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| 549 | Wetlands for Wales : a strategy for the third millenium |
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| 550 | Protecting and improving the water environment : model policies |
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