| 526 | Metal contamination of sediments an statutory quality objectives |
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| 527 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 528 | Contaminated land and the water environment : report of the National Rivers Authority |
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| 529 | Diversion and entrapment of fish at water intakes and outfalls (Report 1) |
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| 530 | Conservation requirements of southern damselfly in chalkstream and fen habitats |
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| 531 | Summary report on blue-green algae toxin analysis, Toxicity Assessment and reporting to the Environment Agency, 1998 |
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| 532 | Crayfish conservation (378/8/N) : interim report for 1993 |
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| 533 | Waterways Breeding Bird Survey: progress and population trends: 1998 |
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| 534 | Scenarios for the operational implementation of remote sensing of snow by satellites : interim report (207/3/N) |
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| 535 | The physical character of rivers and streams in the UK and Isle of Man |
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| 536 | Data for reed litter decay and aquatic macroinvertebrates colonisation |
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| 537 | Assessment of the distribution of Bembidion testaceum and reasons for its decline |
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| 538 | Bioaccumulation as an approach for detection and monitoring of Red List trace organic contaminants (240/11/Y) : a literature review : interim report |
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| 539 | National Centre for Toxic and Persistent Substances : business case |
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| 540 | Review of Sea Trout Fecundity
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| 541 | Algal Monitoring Report 1999. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 1999 |
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| 542 | Algal Monitoring Report 2000. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 2000 |
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| 543 | Ecotoxicology : a report of the NRA R and D Ecotoxicology Group |
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| 544 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 545 | Groundwater storage in British aquifers : chalk - Drawings |
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| 546 | Atlantic Salmon Trust Winter Journal 2005/2006 |
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| 547 | Acid Waters: Llyn Brianne Project- Project Record |
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| 548 | Bank erosion on navigable waterways R and D Report 336/1/T |
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| 549 | Atmospheric inputs of pollutants to surface waters : interim report on trace organics in atmospheric deposition (015/4/T) |
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| 550 | Windermere South Basin Seismic Survey Data 1983 Section 10 |
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