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