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676Method for the assessment of river water quality using benthic macroinvertebrates
677Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
678The National Groundwater and Contaminated Land Centre (NGWCLC)
679The evaluation of a Philips ammonium ion selective electrode (220/14/T)
680The greening of Grasmere: its plankton periodicity in 1988
681A strategic review of the petroleum refinery Industry Sector
682Guidelines for river corridor surveys in the NRA : February 1992. draft 3
683Second annual review of the Sid/Otter catchment management plan 1999
684Contribution of small streams to potential fish production in the Conwy catchment
685NRA strategy for reducing the concentration of pesticides in controlled waters
686Low-cost modifications of the Crump weir to improve fish passage
687Policy and practice for the protection of groundwater - Thames region appendix
688Policy and practice for the protection of floodplains
689'Sea Vigil' water quality monitoring : the Wash 1992-1993
690Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
691The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
692Guidance on the use of Bioassays in Ecological Risk Assessment
693The National Rivers Authority employee attitude survey : summary
694The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
695Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
696Pesticides in the aquatic environment 1997 : executive summary
697Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
698Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
699The Louth coastal catchment management plan : final report
700Fine sediment deposition in the River Keer : geomorphological assessment