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676The greening of Grasmere: its plankton periodicity in 1988
677A strategic review of the petroleum refinery Industry Sector
678Guidelines for river corridor surveys in the NRA : February 1992. draft 3
679Second annual review of the Sid/Otter catchment management plan 1999
680Contribution of small streams to potential fish production in the Conwy catchment
681NRA strategy for reducing the concentration of pesticides in controlled waters
682The ecology and management of riverine trees : interim report
683Low-cost modifications of the Crump weir to improve fish passage
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
693Pesticides in the aquatic environment 1997 : executive summary
694Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
695Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
696The Louth coastal catchment management plan : final report
697Fine sediment deposition in the River Keer : geomorphological assessment
698Snapshots of the environment : a new environmental approach
699Draft protocol for the derivation of Toxicity Based Consents
700The Loddon catchment, Thames : recommendations for statutory water quality objectives