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26The utilisation of stick-pile otter holts in south east Wales
27Pesticides in the aquatic environment 1997 : executive summary
28Economic changes to the value of water environment : draft final report
29Charging for discharges scheme : guidance to the engineering industry
30Charging for discharges scheme : guidance to the power generation industry
31NRA strategy for reducing the concentration of pesticides in controlled waters
32Hams Hall Power Station. A survey of the flora and fauna of freshwater habitats in the environs of Hams Hall Power Station, Birmingham
33Impact of watercress cultivation on river water quality- Progress report for the period January- December 1987
34Review of Literature on the Effect on Aquatic Communities of Particulate Copper in River Systems
35Direct toxicity assessment : a step towards better environmental protection within the UK : business strategy
36Controlling the inputs of persistent chemical to marine waters from land-based sources
37Guardians of the water environment : NRA Welsh Region (bilingual) : Diogelwyr amgyllchedd dwr : rhanbarth Cymru
38The Impact Of Discarded Fishing Line And Tackle On Mute Swans - Phase 1
39Pesticides 1998 : a summary of monitoring of the aquatic environment in England and Wales
40Database and atlas of aquatic vascular plants in the British Isles : part 1 species accounts
41NRA programme for the monitoring of water quality Parts 1 to 3 - November 1994
42Manual for the use of herbicides in or near water : April 1993 : final draft report
43The Impact of Lost and Discarded Fishing Line and Tackle on Mute Swans
44Investigating the feasibility of using neural networks to derive chlorophyll a prediction algorithms for case 2 waters
45Environmental Impacts of Alkylphenol Ethoxylates and Carboxylates. Part 1 Proposals for the Development of Environmental Quality Standards
46Database and atlas of aquatic vascular plants in the British Isles : part 2 : distribution maps (352/2/N and Y)