| 126 | The results of Tawe barrage post-impoundment salmon and sea trout telemetry study 1992 |
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| 127 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 128 | Water pollution incidents in England and Wales - 1992 : report of the National Rivers Authority |
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| 129 | Biological characteristics and exploitation of sea trout in the River Tywi during 1989 |
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| 130 | An evaluation of discharge and consent compliance policy : a blueprint for the future |
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| 131 | Guardians of the water environment : NRA Welsh Region (bilingual) : Diogelwyr amgyllchedd dwr : rhanbarth Cymru |
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| 132 | NRA programme for the monitoring of water quality Parts 1 to 3 - November 1994 |
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| 133 | Proceedings of the conference National Minewaters 20th -21st April 1998 Tapton Hall Sheffield University |
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| 134 | A review of the industrial uses of continuous monitoring systems : minerals industry processes |
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| 135 | Desktop study of methods for the monitoring of particulate emissions from positively pressurised baghouses |
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| 136 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 137 | Pesticides 2000 : a summary of monitoring of the aquatic environment in England and Wales |
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| 138 | A review of the industrial uses of continuous monitoring systems : metals industry processes |
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| 139 | Bathing water quality in England and Wales in 1995 : report of the National Rivers Authority |
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| 140 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 141 | Groundwater pollution : evaluation of the extent and character of groundwater pollution from point sources in England and Wales |
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| 142 | Analysis of growth and survival of sea trout from the Welsh Dee: Interim Report, 2nd April 2000 |
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| 143 | Chemical river quality 1993-1995 according to the general quality assessment (GQA) scheme [map] : scale 1 : 750 000 |
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| 144 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 145 | NRA response to using water wisely : a consultation paper published by the DoE/Welsh Office July 1992 |
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| 146 | The Menai Strait catchment management plan : action plan (bilingual) : Cynllun Rheoli Dalgylch Afon Menai; 1995 Cynllun Gweithredu |
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| 147 | A review of the industrial uses of continuous monitoring systems : incineration processes : a report produced for NCCA and ETSU by Entec |
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| 148 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
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| 149 | Freshwater migration of sea trout (Salmo trutta L.) in the river Tywi during 1988, 1989 and 1990 |
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| 150 | Developing Quality Assurance for Fish Counter Data - Phase 1: An Assessment of the Salmonid Fish Counter Network in England and Wales |
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