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676Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
677The National Groundwater and Contaminated Land Centre (NGWCLC)
678The evaluation of a Philips ammonium ion selective electrode (220/14/T)
679The greening of Grasmere: its plankton periodicity in 1988
680A strategic review of the petroleum refinery Industry Sector
681Guidelines for river corridor surveys in the NRA : February 1992. draft 3
682Second annual review of the Sid/Otter catchment management plan 1999
683Contribution of small streams to potential fish production in the Conwy catchment
684NRA strategy for reducing the concentration of pesticides in controlled waters
685The ecology and management of riverine trees : interim report
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
690Second annual review of the Seaton, Looe and Fowey catchment management plan
691Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
692The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
693Guidance on the use of Bioassays in Ecological Risk Assessment
694The National Rivers Authority employee attitude survey : summary
695Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
696Pesticides in the aquatic environment 1997 : executive summary
697Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
698The Louth coastal catchment management plan : final report
699Fine sediment deposition in the River Keer : geomorphological assessment
700Snapshots of the environment : a new environmental approach