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