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426Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918
427The physical character of rivers and streams in the UK and Isle of Man
428The Distribution of Phytoplankton and Nutrients in the North East Irish Sea During 1998
429Biological assessment of the effects of Ivybridge Sewage Treatment Works on the River Erme
430The impact of industrial discharges on metal levels in biota of the West Cumbrian coast - 1990
431The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment
432A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study
433A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989
434A collation of the environmental impact work carried out following the Rosebay oil spill, May 1990
435The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document
436An investigation into the effects of Alton sewage works on the River Wey North
437Investigation into the impact of Henstridge sewage treatment works on the River Umber, North Devon
438A brief history of the River Stour navigation : 1705 to the present day
439The Investigation and Specification of Flow Measurement Structure Design Features that Aid the Migration of Fish
440Discharges of waste under the EC titanium dioxide directives : report of the National Rivers Authority
441Protecting your future : tackling flooding in the Thames Estuary through the 21st century
442The land-use planning system and the Water Framework Directive (can't read barcode)
443Rural sewage pollution in the '90s : report of the rural sewerage project 1993/4
444Report for Anglian Water, NRA Unit on the uses of the Orwell and the Stour Estuaries and the use of the mathematical model to derive long term consent limits for all inputs to Orwell Estuary
445A review of the use of multifunction wardens in the Devon Area of the South Western Region of the National Rivers Authority, with particular reference to their use within the fisheries function
446Responses to 'Outlook for the environment' : a summary of the responses to the Environment Agency's consulation on the priorities for investment by water companies in environmental improvements as part of the Periodic Review
447Report on the national marine analytical quality control scheme 1993/94 : presented to the 18th October 1994 meeting of the Marine Pollution Monitoring Management Group
448A report on the 1992 strategic stock assessment survey of the upper Dewent catchment and the River Marron with particular reference to salmonids
449Identification of Blue Green Algae of the British Isles Guide to the Genera and Use of the Interactive CD-ROM for Identification of Species
450Outlook for the environment : a consultation paper by the Environment Agency on the priorities for investment by water companies in environmental improvements