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