| 501 | Groundwater management in the North West: efficiency review and business plan: certificate in management |
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| 502 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 503 | Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority |
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| 504 | Manual for the use of herbicides in or near water : January 1993 : final draft report |
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| 505 | Impact assessment of Meldon quarry on water quality in the West Okement river |
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| 506 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 507 | The Environment Agency water efficiency awards 2003 : inspirational case studies demonstrating good practice across all sectors |
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| 508 | Report on the By Brook low flow investigations : October 2001 : volume 1 : report |
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| 509 | A report on water quality issues within the Midford Brook catchment - June 1996 |
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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 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 512 | The development of a portable battery-powered telemetry system for use in water quality investigations |
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| 513 | A review of the hydrogeological information for the Thompson and Merton areas, Norfolk : including predictions of the impact of nearby chalk water abstractions on water levels at Thompson Water, Carr and Common SSSI and candidate SAC |
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| 514 | Development of data and information sources on Natura 2000 estuarine sites in the north west : Morecambe Bay : final report |
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| 515 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period April 1984- March 1988
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| 516 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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| 517 | Eutrophication in controlled waters in the Warwickshire Avon catchment (final report). Vol 1 : report and executive summary |
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| 518 | An investigation into possible causes of poor water quality at Blakewell Bridge (R30A001) on the Bradiford Water |
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| 519 | An investigation to determine if Deep Moor Landfill Site is causing an impact downstream in the Peagham Stream |
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| 520 | A review of the industrial uses of continuous monitoring systems : incineration processes : a report produced for NCCA and ETSU by Entec |
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| 521 | An audit of performance in the analysis of biological samples in 2000. Environment Agency : AQC audit : C00158/11 |
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| 522 | Development of Environmental Standards (Water Resources) Stage 1: Identification of Hydro-morphological parameters to which the aquatuc ecosystems is sensitive |
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| 523 | Economic appraisal and assessment of benefits in the PR04 environment programme : findings of an environment agency seminar, January 2003 |
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| 524 | Evaluating the impact of groundwater abstraction on key conservation sites, final report : Yare Broads and marshes (Strumpshaw Fen) |
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| 525 | Investigation into algal bloom conditions in three fresh water ponds located at the Miniature Pony Centre, Mortonhampstead (1996) |
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