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551The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
552Guidance on the use of Bioassays in Ecological Risk Assessment
553The National Rivers Authority employee attitude survey : summary
554The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
555Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
556Pesticides in the aquatic environment 1997 : executive summary
557Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
558Draft protocol for the derivation of Toxicity Based Consents
559The Loddon catchment, Thames : recommendations for statutory water quality objectives
560Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
561Second Coniston OS map related to the Seismic Survey 1983
562Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
563Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
564Coniston OS map related to the Seismic Survey 1983
565Policy and practice for the protection of groundwater : Southern region appendix
566(Bilingual) Assessing the impact of dewatering on water resources
567Catches of Brown Trout in the River Don
568Biological water quality monitoring in the Midlands region
569A natural assets register for the Sankey catchment. Volume 2
570Non-compliance with water quality objectives on the Croyde stream (upper catchment)
571Bacteriological monitoring of freshwater rivers in the Thames Region 1995
572Impact of breakwaters on the water quality of Sidmouth beach
573Bass fishing in the Fal estuary and coastal area
574Report on the survey of SBM handlers in Devon
575Enhancing the environment : 25 case studies from Thames Region