| 526 | National guidelines for the production of NRA regions 1990/91 regional plans |
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| 527 | Operational mechanisms for the protection and enhancement of headwaters |
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| 528 | Policy and practice for the protection of groundwater : regional appendix Welsh region |
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| 529 | Procurement legislation and the NRA : a brief guide |
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| 530 | Strategic review of development and flood risk : the River Welland catchment |
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| 531 | Strategic review of development and flood risk : the River Witham catchment |
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| 532 | Survey of copper speciation in the Great Ouse estuary |
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| 533 | Sustainable development indicators : monitoring change in the East Midlands |
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| 534 | Technical Support Materials for the Regulation of Radioactively Contaminated Land |
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| 535 | The impact of climate change on severe droughts: Implications for decision making |
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| 536 | The Impact of Grazing and Upland Management on Erosion and Runoff |
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| 537 | The Potential For Generating Hydro-Electricity From Weirs |
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| 538 | The Potential For Aquifer Storage And Recovery In England And Wales |
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| 539 | Water resources for the future : a strategy for Midlands Region |
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| 540 | Water resources for the future : a strategy for Southern region |
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| 541 | Suffolk estuarine strategies : Deben estuary strategy : introduction to the strategy |
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| 542 | The feasibility of biomanipulation in reservoirs and deeper lakes : draft final report |
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| 543 | The development and verification of methodologies for defining groundwater nitrate vulnerable zones |
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| 544 | River Great Ouse navigation : the Great Ouse your river for life |
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| 545 | The Feasibility of Charging for Planning Application Consultations - Final Report |
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| 546 | The use of herbicides in or near water |
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| 547 | Status of rare fish : literature review of Freshwater Fish in the UK |
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| 548 | Suffolk estuarine strategies : Alde and Ore estuary strategy : introduction to the strategy |
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| 549 | Distribution of Azolla in the Great Ouse catchment |
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| 550 | Time of travel on the [River] Chertsey Bourne under low flow conditions |
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