551 | Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134) |
552 | A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake |
553 | Health effects of sea bathing (WMI 9021) - Phase III final report to the Department of the Environment |
554 | Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank |
555 | Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph |
556 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
557 | Final report of the controlled cohort investigations into the health effects of bathing in sewage contaminated coastal waters |
558 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
559 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
560 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
561 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
562 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
563 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
564 | An investigation into the frequency of discharge of three combined sewer overflows in the Afan/Kenfig catchment : TM/EAW/96/06 |
565 | Contaminants entering the sea : a report on contaminant loads entering the seas around England and Wales 1990-1993 |
566 | NRA report of the blue-green algal monitoring 1990 : a report by the toxic blue-green algae task group |
567 | Options for transfer of water from the River Trent and reservoir storage at Great Bradley : technical summary of the feasibility report |
568 | Land use assessment of non-tidal main rivers in the southern region of the National Rivers Authority : report EX 2922 |
569 | The Natural (Baseline) Quality Of Groundwaters In England And Wales: The Permo-Triassic Sandstones Of Cumbria, North-West England; |
570 | PhD Research. Gary Stephen Rushworth. The role of aquatic macroinvertebrates within reedswamps |
571 | POLICY & PRACTICE FOR THE PROTECTION OF GROUNDWATER - DRAWINGS |
572 | 1967 - IBP Lake George, Uganda - starting to build the bedroom block |
573 | Environmental snapshot for the East of England [version 1] |
574 | The regulation of salmon angling in Great Britain
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575 | Disturbing the season's due: plankton periodicity in Grassmere, 1987 |