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26NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group
27Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests
28The biology of the sea trout. Summary of a symposium held at Plas Menai 24-26 October 1984
29A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89
30The Use Of DNA Fingerprinting To Study The Population Dynamics Of Otters (Lutra Lutra) In Southern Britiain - A Feasibility Study
31An assessment of the impact of Berkhamsted and Maple Lodge STWs on the Grand Union canal based on macroinvertebrate surveys
32Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph
33Operational mechanisms for the protection and enhancement of headwaters
34Environmental assessment of selected abandoned minewaters in the North East region
35Stream survey and assessment in the Ashford and Folkestone areas
36Quality audit of biological samples for the 1990 river quality survey
37The drought of 1988-1992 in Anglia : a review
38The 1990 river and estuary classification survey of England and Wales
39Audit report on the 1995 GQA biological survey
40Quality audit of biological samples for the 1991 river quality survey
41The quality of rivers in England and Wales (1990 to 1995)
42Method for the assessment of river water quality using benthic macroinvertebrates
43Guidance on the use of Bioassays in Ecological Risk Assessment
44An Aerial Photograph of Ferry House and The Pearsall Building
45Stratification in the Severn Estuary- Physical aspects and biological consequences
46Biological water quality monitoring in the Midlands region
47Applications Of Artificial Intelligence For The Biological Surveillance Of River Quality
48The River Colne Estuary subtidal biological survey 1992
49Bacteriological monitoring of freshwater rivers in the Thames Region 1995
50Eel and elver studies in the Severn : interim report (256/6/ST)