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5501The behaviour of atrazine and simazine within the chalk aquifer : experimental results and interpretation
5502The use of herbicides to control weeds in or near water
5503Environmental impact of hypolimnial releases from Llyn Brianne
5504Water plants : their function and management
5505A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study
5506Algal Monitoring Report 1999. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 1999
5507Algal Monitoring Report 2000. Report summarising freshwater (cyanobacterial) and marine microalgal monitoring during 2000
5508Direct toxicity assessment : a step towards better environmental protection within the UK : business strategy
5509Road transport and the environment
5510Direct toxicity assessment proficiency scheme (DTAPS) : Document 1 : Issue 5
5511Direct toxicity assessment proficiency scheme (DTAPS) : Document 3 : Issue 10
5512Ecotoxicology : a report of the NRA R and D Ecotoxicology Group
5513Ecotoxicology : new approaches
5514Investigating Links Between Bacterial Exotoxins and Unexplained Fish Kills: Phase 3
5515Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales
5516Analysis of methyl tertiary-butyl ether (MTBE) and other petroleum oxygenates in water
5517Hydrometric asset condition survey action plan 1998 - 2001 : annex 1
5518The results of fish telemetry trails in the river Tawe estuary, 1991
5519Analysis of airborne platform specifications and operations for the National Rivers Authority by Atlantique Reconnaissance Ltd
5520Compact airborne spectrographic imager : CASI
5521Aircraft utilisation study
5522Coastal baseline survey January/February 1995 : results
5523Gulliver
5524National marine baseline survey 1995 : littoral cell 10 : Bardsey Sound to Great Orme
5525Validation of statutory sampling sites using aerial surveillance : case study 4