| 551 | Heavy metal contaminants in fish caught from the Mersey Estuary and inshore Liverpool Bay |
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| 552 | Distribution of Macroinvertebrates in English and Welsh Rivers based on the 1995 Survey |
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| 553 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : primary audit |
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| 554 | The disposal of sheep dip waste (R and D Report 11) : effects on water quality |
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| 555 | Extending Rutland yield analysis to 1933 : supporting documentation for the regional water resources strategy |
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| 556 | Criteria for WFD Groundwater Good 'Quantitative Status' and a framework for the assessment of groundwater abstractions |
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| 557 | Quantification of the relationship between effluent quality and biological quality : interim report for stage 1 |
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| 558 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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| 559 | Analysis of bacteriological contamination and accumulation of metals and organics in the mussel (Mytilus edulis) |
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| 560 | Bathing water quality in England and Wales in 1995 : report of the National Rivers Authority |
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| 561 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 562 | Less sensitive areas and candidate high natural dispersion areas in the North West region |
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| 563 | An investigation into the water quality of a treated effluent from Hambleton Dairy, Todber, Dorset |
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| 564 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 565 | Notice to water only companies of programme of environmental obligations agreed by the Secretary of State for the Environment, Transport and the Regions and for Wales : periodic review of water company price limits 2000-2005 |
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| 566 | 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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| 567 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period April 1984- March 1988
|
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| 568 | Report on two electrofishing surveys carried out between July 10-25 1978 and July 9-12 1979 on the proposed Kielder Water
|
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| 569 | An investigation into possible causes of poor water quality at Blakewell Bridge (R30A001) on the Bradiford Water |
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| 570 | Investigation into algal bloom conditions in three fresh water ponds located at the Miniature Pony Centre, Mortonhampstead (1996) |
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| 571 | Analysis of growth and survival of sea trout from the Welsh Dee: Interim Report, 2nd April 2000 |
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| 572 | Chemical river quality 1993-1995 according to the general quality assessment (GQA) scheme [map] : scale 1 : 750 000 |
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| 573 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 574 | NRA response to using water wisely : a consultation paper published by the DoE/Welsh Office July 1992 |
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| 575 | An investigation into the presence of high levels of cadmium in sea-water samples from Mounts Bay, Cornwall |
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