| 526 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
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| 527 | Draft protocol for the derivation of Toxicity Based Consents |
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| 528 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |
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| 529 | Second Coniston OS map related to the Seismic Survey 1983 |
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| 530 | Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
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| 531 | Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
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| 532 | Coniston OS map related to the Seismic Survey 1983 |
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| 533 | (Bilingual) Assessing the impact of dewatering on water resources |
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| 534 | Catches of Brown Trout in the River Don |
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| 535 | Biological water quality monitoring in the Midlands region |
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| 536 | A natural assets register for the Sankey catchment. Volume 2 |
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| 537 | Non-compliance with water quality objectives on the Croyde stream (upper catchment) |
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| 538 | Impact of breakwaters on the water quality of Sidmouth beach |
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| 539 | Bass fishing in the Fal estuary and coastal area |
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| 540 | Report on the survey of SBM handlers in Devon |
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| 541 | Enhancing the environment : 25 case studies from Thames Region |
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| 542 | Fish Guide 1997/98 A Guide to day ticket fisheries in the Midlands |
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| 543 | Flood warning information for the river Witham and tributaries in Lincolnshire |
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| 544 | Conservation and development of the River Eden spring salmon population |
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| 545 | Flood warning information for North Surrey : The Bournes catchment |
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| 546 | Habitat preferences of the bullhead (Cottus gobio) in some Norfolk rivers |
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| 547 | England's river : a guide to the Thames from Remenham to Cookham |
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| 548 | Regulation of dioxin releases from the Runcorn operations of ICI and EVC |
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| 549 | Investigation of mercury contamination in the Red River catchment, West Cornwall |
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| 550 | An investigation into the incidence of spurting from weeping wall slurry stores |
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