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651The evaluation of a Philips ammonium ion selective electrode (220/14/T)
652The greening of Grasmere: its plankton periodicity in 1988
653A strategic review of the petroleum refinery Industry Sector
654Guidelines for river corridor surveys in the NRA : February 1992. draft 3
655Second annual review of the Sid/Otter catchment management plan 1999
656Contribution of small streams to potential fish production in the Conwy catchment
657The ecology and management of riverine trees : interim report
658Low-cost modifications of the Crump weir to improve fish passage
659Policy and practice for the protection of groundwater - Thames region appendix
660Policy and practice for the protection of floodplains
661'Sea Vigil' water quality monitoring : the Wash 1992-1993
662Second annual review of the Seaton, Looe and Fowey catchment management plan
663The Yarrow catchment : recommendations for statutory water quality objectives
664Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
665The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
666Guidance on the use of Bioassays in Ecological Risk Assessment
667The National Rivers Authority employee attitude survey : summary
668The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
669Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
670Pesticides in the aquatic environment 1997 : executive summary
671Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
672Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
673The Louth coastal catchment management plan : final report
674Snapshots of the environment : a new environmental approach
675Draft protocol for the derivation of Toxicity Based Consents