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601Method for the assessment of river water quality using benthic macroinvertebrates
602The National Groundwater and Contaminated Land Centre (NGWCLC)
603The evaluation of a Philips ammonium ion selective electrode (220/14/T)
604The greening of Grasmere: its plankton periodicity in 1988
605A strategic review of the petroleum refinery Industry Sector
606Guidelines for river corridor surveys in the NRA : February 1992. draft 3
607Second annual review of the Sid/Otter catchment management plan 1999
608Contribution of small streams to potential fish production in the Conwy catchment
609The ecology and management of riverine trees : interim report
610Low-cost modifications of the Crump weir to improve fish passage
611Policy and practice for the protection of groundwater - Thames region appendix
612Policy and practice for the protection of floodplains
613'Sea Vigil' water quality monitoring : the Wash 1992-1993
614Second annual review of the Seaton, Looe and Fowey catchment management plan
615The Yarrow catchment : recommendations for statutory water quality objectives
616Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
617The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
618Guidance on the use of Bioassays in Ecological Risk Assessment
619The National Rivers Authority employee attitude survey : summary
620The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
621Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
622Pesticides in the aquatic environment 1997 : executive summary
623Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
624The Louth coastal catchment management plan : final report
625Snapshots of the environment : a new environmental approach