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651The greening of Grasmere: its plankton periodicity in 1988
652A strategic review of the petroleum refinery Industry Sector
653Second annual review of the Sid/Otter catchment management plan 1999
654Contribution of small streams to potential fish production in the Conwy catchment
655NRA strategy for reducing the concentration of pesticides in controlled waters
656The ecology and management of riverine trees : interim report
657Low-cost modifications of the Crump weir to improve fish passage
658Policy and practice for the protection of groundwater - Thames region appendix
659Policy and practice for the protection of floodplains
660Second annual review of the Seaton, Looe and Fowey catchment management plan
661The Yarrow catchment : recommendations for statutory water quality objectives
662Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
663The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
664Guidance on the use of Bioassays in Ecological Risk Assessment
665The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
666Pesticides in the aquatic environment 1997 : executive summary
667Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
668Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
669The Louth coastal catchment management plan : final report
670Fine sediment deposition in the River Keer : geomorphological assessment
671Snapshots of the environment : a new environmental approach
672Draft protocol for the derivation of Toxicity Based Consents
673The Loddon catchment, Thames : recommendations for statutory water quality objectives
674Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
675The flood of February 1990 : technical services flood monitoring report