| 501 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 502 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk A |
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| 503 | The development of a portable battery-powered telemetry system for use in water quality investigations |
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| 504 | Impact assessment of Meldon quarry on water quality in the West Okement river |
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| 505 | River Meavy salmon and sea trout populations : assessment of the impact of flows |
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| 506 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk C |
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| 507 | The effect of ferric dosing of lakes on benthic invertebrates : first year report |
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| 508 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk D |
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| 509 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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| 510 | The distribution of PCDDS and PCDFS in surface freshwater systems 2nd Interim Progress Report - February 1993 |
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| 511 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk M |
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| 512 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 513 | YSI, turbidity and discharge data for the Wensum Demonstration Test Catchment's monitoring kiosk M in 2013 |
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| 514 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 515 | Use Of Pattern Recognition To Identify The Source Of An Oil Spill On An Inland Water |
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| 516 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk A in 2014 |
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| 517 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk A in 2013 |
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| 518 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk B |
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| 519 | Effects of suspended solids on salmon (Salmo salar, L.) in the Parrett stuary, Somerset, Draft |
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| 520 | Two year aesthetic survey of beaches in the South West (1990 and 1991) |
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| 521 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 522 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 523 | Guidance on the Development of Typology and Classification Systems for Transitional and Coastal Waters |
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| 524 | Technical basis for the predicted impacts of relocating Redgrave abstraction to Borehole B |
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| 525 | River Wissey investigations : linking hydrology and ecology : summary of a recommendations for the River Wissey (OI/526) |
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