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626The National Groundwater and Contaminated Land Centre (NGWCLC)
627The evaluation of a Philips ammonium ion selective electrode (220/14/T)
628The greening of Grasmere: its plankton periodicity in 1988
629A strategic review of the petroleum refinery Industry Sector
630Guidelines for river corridor surveys in the NRA : February 1992. draft 3
631Contribution of small streams to potential fish production in the Conwy catchment
632NRA strategy for reducing the concentration of pesticides in controlled waters
633The ecology and management of riverine trees : interim report
634Low-cost modifications of the Crump weir to improve fish passage
635Policy and practice for the protection of floodplains
636'Sea Vigil' water quality monitoring : the Wash 1992-1993
637The Yarrow catchment : recommendations for statutory water quality objectives
638Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
639The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
640Guidance on the use of Bioassays in Ecological Risk Assessment
641The National Rivers Authority employee attitude survey : summary
642The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
643Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
644Pesticides in the aquatic environment 1997 : executive summary
645Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
646Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
647Fine sediment deposition in the River Keer : geomorphological assessment
648Draft protocol for the derivation of Toxicity Based Consents
649Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
650Second Coniston OS map related to the Seismic Survey 1983