| 126 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : AQC audit |
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| 127 | An audit of performance in the analysis of biological samples in 1998. Environment Agency : primary audit |
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| 128 | Digital groundwater vulnerability maps : 1 : 100,000 series. Policy and practice for the protection of groundwater |
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| 129 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 130 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 131 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 132 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 133 | The available resource methodology : a framework for assessing water resources and abstraction availability : final report |
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| 134 | A review of the industrial uses of continuous monitoring systems : minerals industry processes |
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| 135 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
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| 136 | An evaluation of discharge and consent compliance policy : a blueprint for the future |
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| 137 | An evaluation of discharge and consent compliance policy : a blueprint for the future : letters from respondents |
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| 138 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 139 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 140 | Desktop study of methods for the monitoring of particulate emissions from positively pressurised baghouses |
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| 141 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 142 | Groundwater pollution : evaluation of the extent and character of groundwater pollution from point sources in England and Wales |
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| 143 | Report for Welsh Region on selected flood defence schemes and the development of a standard methodology for risk assessment |
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| 144 | Freshwater migration of sea trout (Salmo trutta L.) in the river Tywi during 1988, 1989 and 1990 |
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| 145 | The faunal richness of headwater streams. Stage 3 : impact of agricultural activities. Volume 2 : appendices (Note 392) |
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| 146 | Water resources for the future : a strategy for Wales (Bilingual) : Adnoddau dwr ar gyfer y dyfodol (Bilingual) |
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| 147 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 148 | Analysis of growth and survival of sea trout from the Welsh Dee: Interim Report, 2nd April 2000 |
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| 149 | List of R and D outputs September 1989 to September 1995 : the National Rivers Authority's R and D programme |
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| 150 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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