| 501 | Technical basis for the predicted impacts of relocating Redgrave abstraction to Borehole B |
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| 502 | River Wissey investigations : linking hydrology and ecology : summary of a recommendations for the River Wissey (OI/526) |
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| 503 | Investigation of tecnazene contamination in the Chyandour Brook west Cornwall during spring 1990 |
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| 504 | Review of Lake Benthic Macro-invertebrate Sampling Methods and Strategy for the Water Framework Directive |
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| 505 | The Environment Agency water efficiency awards 2003 : inspirational case studies demonstrating good practice across all sectors |
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| 506 | The impact of climate change on severe droughts: River-flow reconstructions and implied groundwater levels |
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| 507 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk C |
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| 508 | NRA programme for the monitoring of water quality Parts 1 to 3 - November 1994 |
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| 509 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk E |
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| 510 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk F |
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| 511 | Proceedings of the conference National Minewaters 20th -21st April 1998 Tapton Hall Sheffield University |
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| 512 | National marine baseline survey 1995 : littoral cell 4 : the Thames to Selsey Bill |
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| 513 | Distribution of Macroinvertebrates in English and Welsh Rivers based on the 1995 Survey |
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| 514 | The disposal of sheep dip waste (R and D Report 11) : effects on water quality |
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| 515 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk F |
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| 516 | Criteria for WFD Groundwater Good 'Quantitative Status' and a framework for the assessment of groundwater abstractions |
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| 517 | Quantification of the relationship between effluent quality and biological quality : interim report for stage 1 |
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| 518 | Bathing water quality in England and Wales in 1995 : report of the National Rivers Authority |
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| 519 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk M |
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| 520 | YSI, turbidity and discharge data for the Wensum Demonstration Test Catchment's monitoring kiosk M in 2014 |
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| 521 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk A in 2012 |
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| 522 | Devon area internal report - further investigations into pipe discharges in the Lower Teign estuary |
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| 523 | Alleviation of low flow studies : the River Avon and its tributaries near Malmesbury : towards a solution |
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| 524 | A report on water quality issues within the Midford Brook catchment - June 1996 |
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| 525 | National marine baseline survey 1995 : littoral cell 11 : Great Orme to the Solway Firth |
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