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551Method for the assessment of river water quality using benthic macroinvertebrates
552Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
553The National Groundwater and Contaminated Land Centre (NGWCLC)
554The evaluation of a Philips ammonium ion selective electrode (220/14/T)
555The greening of Grasmere: its plankton periodicity in 1988
556A strategic review of the petroleum refinery Industry Sector
557Guidelines for river corridor surveys in the NRA : February 1992. draft 3
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
561'Sea Vigil' water quality monitoring : the Wash 1992-1993
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
570Draft protocol for the derivation of Toxicity Based Consents
571Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
572Second Coniston OS map related to the Seismic Survey 1983
573Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
574Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
575Coniston OS map related to the Seismic Survey 1983