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