| 51 | Quality audit of biological samples for the 1990 river quality survey |
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| 52 | The quality of rivers in England and Wales (1990 to 1995) |
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| 53 | Water quality in Anglian Region : the first five years |
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| 54 | A Review of Methods for Assessing the Hydromorphology of Lakes |
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| 55 | Guidance for estimating the air quality impact of stationary sources - GN 24 |
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| 56 | The Mersey Estuary 1992 surveys : summary of results |
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| 57 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |
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| 58 | A report on the River Chew at Chewton Mendip, 6th August 1992 |
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| 59 | A review of the optimum accuracy of flow and rainfall forecasting |
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| 60 | Report on monitoring of environmental quality in the Severn Estuary |
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| 61 | River quality in England and Wales : a report of the 1990 survey |
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| 62 | An investigation into the bathing water quality at Porthallow |
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| 63 | The Ribble Estuary 1992 surveys : summary of results |
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| 64 | Quality audit of biological samples for the 1991 river quality survey |
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| 65 | Charging for discharges scheme : guidance to the agricultural industry |
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| 66 | Stream survey and assessment in the Ashford and Folkestone areas |
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| 67 | Wash zone report. Part 1 : the Wash NRA monitoring review |
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| 68 | The fuel additive MTBE - a groundwater protection issue? |
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| 69 | An investigation of the water quality in three Plymouth catchment streams |
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| 70 | Recommendations For The Processing And Presentation Of Groundwater Quality Data |
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| 71 | The 1990 river and estuary classification survey of England and Wales |
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| 72 | Applications Of Artificial Intelligence For The Biological Surveillance Of River Quality |
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| 73 | Cyanobacteria (blue-green algae) in the south west region 1989 |
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| 74 | Alternative Methods For The Biological Classification Of Rivers |
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| 75 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
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