501 | Sustainable urban drainage : an introduction : protecting the quality of our environment |
502 | The effects of fishing at low water levels |
503 | 1967 - George and Gideon cutting mbati for the bedroom block. |
504 | 1967 - Quakers arriving on the shore of L.George. |
505 | First annual review of the Taw/Torridge estuary catchment management plan (1996)
|
506 | Method for the assessment of river water quality using benthic macroinvertebrates |
507 | Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide |
508 | The National Groundwater and Contaminated Land Centre (NGWCLC) |
509 | The evaluation of a Philips ammonium ion selective electrode (220/14/T) |
510 | The greening of Grasmere: its plankton periodicity in 1988 |
511 | A strategic review of the petroleum refinery Industry Sector |
512 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
513 | Contribution of small streams to potential fish production in the Conwy catchment |
514 | NRA strategy for reducing the concentration of pesticides in controlled waters |
515 | Low-cost modifications of the Crump weir to improve fish passage |
516 | Policy and practice for the protection of floodplains |
517 | The Yarrow catchment : recommendations for statutory water quality objectives |
518 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
519 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
520 | Guidance on the use of Bioassays in Ecological Risk Assessment |
521 | The National Rivers Authority employee attitude survey : summary |
522 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
523 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
524 | Pesticides in the aquatic environment 1997 : executive summary |
525 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |