| 651 | Water and the environment in times of drought |
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| 652 | Macroinvertebrates of the River Nar : Great Ouse catchment : draft report |
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| 653 | Water and the environment in times of drought |
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| 654 | A strategy for the management of salmon in England and Wales |
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| 655 | Algae or sewage? : helping you tell the difference |
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| 656 | The Role Of Bankside Habitat In River Ecology |
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| 657 | Economic changes to the value of water environment : draft final report |
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| 658 | NRA superannuation report and accounts for the period ended 31 March 1990 |
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| 659 | Wash zone report. Part 1 : the Wash NRA monitoring review |
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| 660 | Broadland flood alleviation strategy : the programme for flood defence works |
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| 661 | Water quality 2000 : a strategy for the water quality function |
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| 662 | The Cam catchment, Anglian region : proposals for statutory water quality objectives |
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| 663 | Computer files used in the calculation of Rutland and Grafham yields |
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| 664 | The control of effluent discharges by a direct toxicity assessment (DTA) approach |
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| 665 | The Restoration of Floodplain Woodlands in Lowland Britain |
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| 666 | Take to the water : a beginner's guide to boating on inland waterways |
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| 667 | Report on the quality of bathing waters 1990 |
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| 668 | Guidance on the Assessment of Cause and Effect in Ecological Risk Assessment |
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| 669 | Wetlands for Wales : a strategy for the third millenium |
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| 670 | The Warwickshire Avon catchment management plan : consultation report : March 1994 |
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| 671 | Protecting and improving the water environment : model policies |
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| 672 | The Impacts of flooding on urban and rural communities |
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| 673 | The River Thame : catchment review : first draft - 16th Februrary 1996 |
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| 674 | The relationship between turbidity and suspended solids in final effluents |
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| 675 | General guide to the prevention of pollution of controlled water |
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