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626The evaluation of a Philips ammonium ion selective electrode (220/14/T)
627The greening of Grasmere: its plankton periodicity in 1988
628A strategic review of the petroleum refinery Industry Sector
629Guidelines for river corridor surveys in the NRA : February 1992. draft 3
630Second annual review of the Sid/Otter catchment management plan 1999
631Contribution of small streams to potential fish production in the Conwy catchment
632The ecology and management of riverine trees : interim report
633Low-cost modifications of the Crump weir to improve fish passage
634Policy and practice for the protection of groundwater - Thames region appendix
635Policy and practice for the protection of floodplains
636Second annual review of the Seaton, Looe and Fowey catchment management plan
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)
647Snapshots of the environment : a new environmental approach
648Draft protocol for the derivation of Toxicity Based Consents
649The Loddon catchment, Thames : recommendations for statutory water quality objectives
650Assessment of the Impact of Nutrient Removal on Eutrophic Rivers