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551Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
552The National Groundwater and Contaminated Land Centre (NGWCLC)
553The evaluation of a Philips ammonium ion selective electrode (220/14/T)
554The greening of Grasmere: its plankton periodicity in 1988
555A strategic review of the petroleum refinery Industry Sector
556Guidelines for river corridor surveys in the NRA : February 1992. draft 3
557Contribution of small streams to potential fish production in the Conwy catchment
558NRA strategy for reducing the concentration of pesticides in controlled waters
559Low-cost modifications of the Crump weir to improve fish passage
560Policy and practice for the protection of floodplains
561The Yarrow catchment : recommendations for statutory water quality objectives
562Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
563The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
564Guidance on the use of Bioassays in Ecological Risk Assessment
565The National Rivers Authority employee attitude survey : summary
566The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
567Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
568Pesticides in the aquatic environment 1997 : executive summary
569Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
570Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
571Draft protocol for the derivation of Toxicity Based Consents
572The Loddon catchment, Thames : recommendations for statutory water quality objectives
573Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
574Second Coniston OS map related to the Seismic Survey 1983
575Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983