651 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
652 | Contribution of small streams to potential fish production in the Conwy catchment |
653 | NRA strategy for reducing the concentration of pesticides in controlled waters |
654 | The ecology and management of riverine trees : interim report |
655 | Low-cost modifications of the Crump weir to improve fish passage |
656 | Policy and practice for the protection of groundwater - Thames region appendix |
657 | Policy and practice for the protection of floodplains |
658 | 'Sea Vigil' water quality monitoring : the Wash 1992-1993 |
659 | Second annual review of the Seaton, Looe and Fowey catchment management plan |
660 | The Yarrow catchment : recommendations for statutory water quality objectives |
661 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
662 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
663 | Guidance on the use of Bioassays in Ecological Risk Assessment |
664 | The National Rivers Authority employee attitude survey : summary |
665 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
666 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
667 | Pesticides in the aquatic environment 1997 : executive summary |
668 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
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 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |
675 | Second Coniston OS map related to the Seismic Survey 1983 |