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601The evaluation of a Philips ammonium ion selective electrode (220/14/T)
602The greening of Grasmere: its plankton periodicity in 1988
603A strategic review of the petroleum refinery Industry Sector
604Guidelines for river corridor surveys in the NRA : February 1992. draft 3
605Contribution of small streams to potential fish production in the Conwy catchment
606NRA strategy for reducing the concentration of pesticides in controlled waters
607The ecology and management of riverine trees : interim report
608Low-cost modifications of the Crump weir to improve fish passage
609Policy and practice for the protection of groundwater - Thames region appendix
610Policy and practice for the protection of floodplains
611'Sea Vigil' water quality monitoring : the Wash 1992-1993
612Second annual review of the Seaton, Looe and Fowey catchment management plan
613The Yarrow catchment : recommendations for statutory water quality objectives
614Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
615The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
616The National Rivers Authority employee attitude survey : summary
617The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
618Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
619Pesticides in the aquatic environment 1997 : executive summary
620Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
621The Louth coastal catchment management plan : final report
622Fine sediment deposition in the River Keer : geomorphological assessment
623Snapshots of the environment : a new environmental approach
624Draft protocol for the derivation of Toxicity Based Consents
625Second Coniston OS map related to the Seismic Survey 1983