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526Front Cover of Some Methods for the Statistical Analysis of Samples of Benthic Invertebrates
527Assessment of the nutrient status and associated algal productivity of Malham Tarn, Yorkshire
528Invertebrates of Esthwaite in relation to development of fish farming in the South Basin
529Review of Literature on the Effect on Aquatic Communities of Particulate Copper in River Systems
530Pesticides 1998 : a summary of monitoring of the aquatic environment in England and Wales
531Planning application for the proposed Maidenhead, Windsor and Eton flood alleviation scheme January 1991
532Database and atlas of aquatic vascular plants in the British Isles : part 1 species accounts
533The evaluation of a Partech model 5100 hand-held dissolved oxygen meter (220/26/T)
534Catches of Brown Trout in the River Don - Preliminary analysis of Angler's Returns
535Front Cover of A Key to the British Freshwater Cyclopid and Calanoid Copepods, with Ecological Notes
536Investigation into the storm overflow discharge regime of Hill Barton Seawage Treatment Works Okehampton
537Survey of physical characteristics of salmon spawning riffles in the river North Tyne
538Nitrates in surface water, inputs and seasonality- Progress report for the period April- December 1987
539Thames 21 - a planning perspective and a sustainable strategy for the Thames Region : consultation draft
540Environmental protection - the waste management licensing regulations 1994 : amended and consolidated. Version 5
541Problems and solutions in the management of open seas fisheries for Atlantic salmon
542Space to live, space to play : a recreation strategy for the River Thames : appendices
543Blooming weather: Predicting the incidence of summers with high-risk of cyanobacterial blooms
544Mercury and methylmercury in the river Yare, Norfolk (1986 - 1992) : executive summary (OI/420/9/A)
545Best Available Techniques For The Control Of Pollution In Petrochemical And Large Volume Organic Chemical Processes
546An approach to hydrogeological assessment of Quaternary deposits in the UK: Part 1 Background
547Developing Guidance for Setting Limits on Radioactive Discharges to the Environment from Nuclear-licensed Sites
548Procedures and results of biochemical oxygen demand tests carried out at the Crossness laboratory 1990
549Research and development 2000 : a strategy for the research and development support service : version 2
550The Use of Catch Statistics to Monitor Fishery Change - Coarse Fish Study - Synopsis