| 501 | User notes for the Deben groundwater modelling package |
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| 502 | London's river (information pack on the River Thames) |
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| 503 | Water and the environment in times of drought |
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| 504 | A strategy for the management of salmon in England and Wales |
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| 505 | Algae or sewage? : helping you tell the difference |
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| 506 | The Role Of Bankside Habitat In River Ecology |
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| 507 | Economic changes to the value of water environment : draft final report |
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| 508 | NRA superannuation report and accounts for the period ended 31 March 1990 |
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| 509 | Broadland flood alleviation strategy : the programme for flood defence works |
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| 510 | Take to the water : a beginner's guide to boating on inland waterways |
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| 511 | Guidance on the Assessment of Cause and Effect in Ecological Risk Assessment |
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| 512 | Wetlands for Wales : a strategy for the third millenium |
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| 513 | The Impacts of flooding on urban and rural communities |
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| 514 | The River Thame : catchment review : first draft - 16th Februrary 1996 |
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| 515 | The relationship between turbidity and suspended solids in final effluents |
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| 516 | The Environmental Impact of Fish Farming - A Review |
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| 517 | The Removal of Technetium from EARP Waste Streams, Phase II |
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| 518 | Benchmarking rainfall runoff models within the Anglian Region : final report |
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| 519 | Evaluation of AN analytical sensors ammonium probe for the grant\YSI 3800 |
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| 520 | Steady-state particle tracking in the object-orientated regional groundwater model ZOOMQ3D |
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| 521 | Roger Sweeting providing a commentary on The Tern |
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| 522 | Policy and practice for the protection of groundwater |
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| 523 | Welland and Glen river system : flood defences along the Welland and Glen |
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| 524 | The National Centre for Environmental Data and Surveillance : business plan 1999/2000 |
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| 525 | The Hydrogeological Classification of Superficial Clay: Methodology of Map Production |
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