| 501 | Entomology For Angler's Course (2009) 18 |
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| 502 | Entomology For Angler's Course (2009) 19 |
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| 503 | Candidate substances requiring Environmental Quality Standards (EQS) |
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| 504 | Deveoplment of a Framework for Assessing the Suitability of Controlled Landfills to Accept Disposal of Solid Low-Level Radioactive Waste: Principles Document |
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| 505 | Metal contamination of sediments an statutory quality objectives |
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| 506 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 507 | Contaminated land and the water environment : report of the National Rivers Authority |
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| 508 | Diversion and entrapment of fish at water intakes and outfalls (Report 1) |
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| 509 | Conservation requirements of southern damselfly in chalkstream and fen habitats |
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| 510 | Summary report on blue-green algae toxin analysis, Toxicity Assessment and reporting to the Environment Agency, 1998 |
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| 511 | Crayfish conservation (378/8/N) : interim report for 1993 |
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| 512 | Waterways Breeding Bird Survey: progress and population trends: 1998 |
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| 513 | Scenarios for the operational implementation of remote sensing of snow by satellites : interim report (207/3/N) |
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| 514 | The physical character of rivers and streams in the UK and Isle of Man |
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| 515 | Data for reed litter decay and aquatic macroinvertebrates colonisation |
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| 516 | Assessment of the distribution of Bembidion testaceum and reasons for its decline |
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| 517 | 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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| 518 | National Centre for Toxic and Persistent Substances : business case |
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| 519 | Review of Sea Trout Fecundity
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| 520 | Algal Monitoring Report 1999. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 1999 |
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| 521 | Algal Monitoring Report 2000. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 2000 |
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| 522 | Ecotoxicology : a report of the NRA R and D Ecotoxicology Group |
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| 523 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 524 | Groundwater storage in British aquifers : chalk - Drawings |
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| 525 | Atlantic Salmon Trust Winter Journal 2005/2006 |
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