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551Guidelines for river corridor surveys in the NRA : February 1992. draft 3
552Contribution of small streams to potential fish production in the Conwy catchment
553NRA strategy for reducing the concentration of pesticides in controlled waters
554Low-cost modifications of the Crump weir to improve fish passage
555Policy and practice for the protection of floodplains
556The Yarrow catchment : recommendations for statutory water quality objectives
557Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
558The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
559Guidance on the use of Bioassays in Ecological Risk Assessment
560The National Rivers Authority employee attitude survey : summary
561The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
562Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
563Pesticides in the aquatic environment 1997 : executive summary
564Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
565Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
566Draft protocol for the derivation of Toxicity Based Consents
567The Loddon catchment, Thames : recommendations for statutory water quality objectives
568Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
569Second Coniston OS map related to the Seismic Survey 1983
570Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
571Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
572Coniston OS map related to the Seismic Survey 1983
573Policy and practice for the protection of groundwater : Southern region appendix
574(Bilingual) Assessing the impact of dewatering on water resources
575Biological water quality monitoring in the Midlands region