| 51 | A litter assessment of two major tributaries of the Taff, the Cynon and the Rhondda : surveyed March - April 1990 |
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| 52 | The control of phosphorus in the catchment of the rivers Ant and Bure : interim report for period January - December 1992 |
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| 53 | Rivers of the Isle of Wight |
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| 54 | The River Lark project Model Manual |
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| 55 | Flood defences : the Lower Witham strategy |
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| 56 | Pollution control on the River Alt |
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| 57 | The river Aire conservation within the catchment : a summary of survey methods and information held on the wildlife of the river Aire catchment |
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| 58 | Fish found in the tidal Thames |
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| 59 | Safeguarding the lower bristol avon - public consultation |
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| 60 | Beneath the town : safeguarding Bodmin from flooding |
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| 61 | Canoeist guide to the River Severn |
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| 62 | Lake restoration : the role of biomanipulation : a one day seminar held in the Broads 18th March 1993 : organised by the National Rivers Authority and the Broads Authority |
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| 63 | The River Ogmore action plan support document |
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| 64 | The Tame catchment (NRA Severn-Trent 67) |
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| 65 | River water quality in the Midlands 1997 |
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| 66 | River water quality in the Midlands 1998 |
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| 67 | Phosphate in the cut-off channel |
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| 68 | The River Lark project Final Report |
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| 69 | The Ely Ouse Essex water transfer scheme |
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| 70 | The Nidd and Wharfe catchment (river factfiles) |
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| 71 | Study of the behaviour and impact of two sewage treatment works of the Thames catchment |
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| 72 | The water protection zone (River Dee catchment) designation order : supplementary paper in support of the application |
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| 73 | A review of the performance of Aldershot STW and its effect on the River Blackwater |
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| 74 | The Ribble fisheries management plan : a consultation document produced by the National Rivers Authority |
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| 75 | An investigation into the water quality of the River Waldon during wet weather |
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