| 526 | The Use of Immuno Based Techniques for Chemical Analysis |
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| 527 | Snapshots of the environment : integrated river basin management |
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| 528 | Water from the River Dee : a working partnership |
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| 529 | Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991 |
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| 530 | The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T) |
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| 531 | The evaluation of ingold ion selective ammonium electrode (220/23/T) |
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| 532 | Rivers of the Isle of Wight fact file |
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| 533 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 534 | Catches of migratory fish in the River Don, Aberdeenshire |
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| 535 | Lakes, Ponds and Reservoirs in the Southern Region (NRA) |
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| 536 | An Independent Review of the Defra/EA Research and Development Joint |
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| 537 | Dissemination of the Revitalised FEH Rainfall-runoff Method |
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| 538 | General guide to the prevention of water pollution |
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| 539 | Guidance for the Development of Housing on Land Affected by Contamination |
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| 540 | Guidance on the use of Soil Screening Values for Ecological Risk Assessment |
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| 541 | Highway runoff: Effects of soluble pollutants on the ecology of receiving waters |
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| 542 | Life cycle assessment of disposable and reusable nappies in the UK |
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| 543 | Managing the social aspects of flooding: Synthesis Report |
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| 544 | Model For Investigating The Impacts Of Groundwater Abstraction |
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| 545 | National guidelines for the production of NRA regions 1990/91 regional plans |
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| 546 | Policy and practice for the protection of groundwater : regional appendix Welsh region |
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| 547 | Procurement legislation and the NRA : a brief guide |
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| 548 | Strategic review of development and flood risk : the River Welland catchment |
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| 549 | Strategic review of development and flood risk : the River Witham catchment |
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| 550 | Survey of copper speciation in the Great Ouse estuary |
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