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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
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
691Second annual review of the Seaton, Looe and Fowey catchment management plan
692The Yarrow catchment : recommendations for statutory water quality objectives
693The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
694The National Rivers Authority employee attitude survey : summary
695The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
696Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
697Pesticides in the aquatic environment 1997 : executive summary
698Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
699Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
700The Louth coastal catchment management plan : final report