| 501 | A natural assets register for the Sankey catchment. Volume 2 |
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| 502 | Data mining of calculations for the control of emissions of organic compounds |
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| 503 | Environmental protection and pollution control : in the North West |
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| 504 | Impact of breakwaters on the water quality of Sidmouth beach |
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| 505 | Report on the survey of SBM handlers in Devon |
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| 506 | Environmental assessment of selected abandoned minewaters in the North East region |
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| 507 | Improving the environment in Midlands region : Midlands local contribution 2006/11 |
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| 508 | Regulation of dioxin releases from the Runcorn operations of ICI and EVC |
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| 509 | Partnership in environmental protection : schemes in the Midlands Region 1995 - 1996 |
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| 510 | Investigation of mercury contamination in the Red River catchment, West Cornwall |
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| 511 | An investigation into the incidence of spurting from weeping wall slurry stores |
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| 512 | NRA superannuation report and accounts for the period ended 31 March 1991 |
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| 513 | Assessing the impact of dewatering on water resources |
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| 514 | The use and design of oil separators in surface water drainage systems |
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| 515 | Improving the Environment Agency's contribution to wetland bird populations |
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| 516 | Groundwater-surface Water Interactions in the Hyporheic Zone |
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| 517 | Applications Of Artificial Intelligence For The Biological Surveillance Of River Quality |
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| 518 | Reappraisal of the River Lee to Wheathampstead Mill |
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| 519 | Business requirement specification : integrated accounting system for the (IAS) |
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| 520 | A report on fish production in the National Rivers Authority |
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| 521 | Moston Brook Summary Report for the Evidence and Measures Project |
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| 522 | Corporate Environmental Reporting in the UK Water Sector - A Concise Review |
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| 523 | Strategy for the use of field instrumentation in water quality monitoring |
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| 524 | User notes for the Deben groundwater modelling package |
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| 525 | Anthropogenic Influences on the temperature regime in a chalk river |
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