| 26 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 27 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
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| 28 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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| 29 | The biology of the sea trout. Summary of a symposium held at Plas Menai 24-26 October 1984 |
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| 30 | A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89 |
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| 31 | The Use Of DNA Fingerprinting To Study The Population Dynamics Of Otters (Lutra Lutra) In Southern Britiain - A Feasibility Study |
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| 32 | Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph |
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| 33 | Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide |
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| 34 | Operational mechanisms for the protection and enhancement of headwaters |
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| 35 | Environmental assessment of selected abandoned minewaters in the North East region |
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| 36 | Stream survey and assessment in the Ashford and Folkestone areas |
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| 37 | An assessment of water quality in the River Yarty catchment |
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| 38 | Alternative Methods For The Biological Classification Of Rivers |
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| 39 | Quality audit of biological samples for the 1990 river quality survey |
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| 40 | The drought of 1988-1992 in Anglia : a review |
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| 41 | The 1990 river and estuary classification survey of England and Wales |
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| 42 | Audit report on the 1995 GQA biological survey |
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| 43 | Assessing and controlling the ecotoxicity of complex effluents |
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| 44 | The quality of rivers in England and Wales (1990 to 1995) |
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| 45 | Method for the assessment of river water quality using benthic macroinvertebrates |
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| 46 | Quantification of the relationship between effluent quality and biological quality : final report |
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| 47 | Guidance on the use of Bioassays in Ecological Risk Assessment |
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| 48 | An Aerial Photograph of Ferry House and The Pearsall Building |
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| 49 | Stratification in the Severn Estuary- Physical aspects and biological consequences |
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| 50 | Biological water quality monitoring in the Midlands region |
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