651 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
652 | Second annual review of the Sid/Otter catchment management plan 1999 |
653 | Contribution of small streams to potential fish production in the Conwy catchment |
654 | NRA strategy for reducing the concentration of pesticides in controlled waters |
655 | The ecology and management of riverine trees : interim report |
656 | Low-cost modifications of the Crump weir to improve fish passage |
657 | Policy and practice for the protection of groundwater - Thames region appendix |
658 | Policy and practice for the protection of floodplains |
659 | 'Sea Vigil' water quality monitoring : the Wash 1992-1993 |
660 | Second annual review of the Seaton, Looe and Fowey catchment management plan |
661 | The Yarrow catchment : recommendations for statutory water quality objectives |
662 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
663 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
664 | Guidance on the use of Bioassays in Ecological Risk Assessment |
665 | The National Rivers Authority employee attitude survey : summary |
666 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
667 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
668 | Pesticides in the aquatic environment 1997 : executive summary |
669 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
670 | The Louth coastal catchment management plan : final report |
671 | Fine sediment deposition in the River Keer : geomorphological assessment |
672 | Snapshots of the environment : a new environmental approach |
673 | Draft protocol for the derivation of Toxicity Based Consents |
674 | The Loddon catchment, Thames : recommendations for statutory water quality objectives |
675 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |