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451Review of flood defence practices on the Somerset Levels and Moors : the report
452Estuarine fish survey 1989 : inferences on the pollution status of the Thames estuary
453Investigation of the water quality in the Buckland stream up and downstream of East/West Buckland
454The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration
455Planning for the rising tides : the Humber estuary shoreline management plan. Summary of proposals
456Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918
457The influence of agriculture on the quality of natural waters in England and Wales
458The physical character of rivers and streams in the UK and Isle of Man
459The Distribution of Phytoplankton and Nutrients in the North East Irish Sea During 1998
460Biological assessment of the effects of Ivybridge Sewage Treatment Works on the River Erme
461The impact of industrial discharges on metal levels in biota of the West Cumbrian coast - 1990
462The impact of land use on salmonids (Report 30) : a study of the River Torridge catchment
463The behaviour of atrazine and simazine within the chalk aquifer : experimental results and interpretation
464A unified information system to satisfy the NRA's requirement for ecotoxicology information: the specification study
465A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989
466A collation of the environmental impact work carried out following the Rosebay oil spill, May 1990
467The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document
468An investigation into the effects of Alton sewage works on the River Wey North
469Investigation into the impact of Henstridge sewage treatment works on the River Umber, North Devon
470A brief history of the River Stour navigation : 1705 to the present day
471The Investigation and Specification of Flow Measurement Structure Design Features that Aid the Migration of Fish
472Discharges of waste under the EC titanium dioxide directives : report of the National Rivers Authority
473Protecting your future : tackling flooding in the Thames Estuary through the 21st century
474The land-use planning system and the Water Framework Directive (can't read barcode)
475The Natural (Baseline) Quality Of Groundwaters In England And Wales - The Culm Aquifers, SW England;