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6551The use of herbicides to control weeds in or near water
6552Environmental impact of hypolimnial releases from Llyn Brianne
6553Water plants : their function and management
6554A review of available information sources for assessing the hazards and risks of chemical substances in the environment. Final report : recommendations for the acquistion of certain sources of environmental data
6555A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study
6556Ecotoxicology : a report of the NRA R and D Ecotoxicology Group
6557Ecotoxicology : new approaches
6558Investigating Links Between Bacterial Exotoxins and Unexplained Fish Kills: Phase 3
6559Hydrodat : groundwater monitoring database system. Guidelines
6560Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales
6561Analysis of methyl tertiary-butyl ether (MTBE) and other petroleum oxygenates in water
6562Hydrometric asset condition survey action plan 1998 - 2001 : annex 1
6563The results of fish telemetry trails in the river Tawe estuary, 1991
6564Analysis of airborne platform specifications and operations for the National Rivers Authority by Atlantique Reconnaissance Ltd
6565Compact airborne spectrographic imager : CASI
6566Aircraft utilisation study
6567Coastal baseline survey January/February 1995 : results
6568Gulliver
6569National marine baseline survey 1995 : littoral cell 10 : Bardsey Sound to Great Orme
6570Validation of statutory sampling sites using aerial surveillance : case study 4
6571Airborne remote sensing of coastal waters (RanD 328/2/Wx) : draft final report
6572Effective flood warning the Australian way : the Winston Churchill Travelling Fellowship visit to Australia and New Zealand 23 October - 27 November 1994
6573A brief guide to the medway
6574A brief guide to the thames
6575Aquatic eutrophication (leaflet)