| 51 | Enhancing the River Otter |
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| 52 | The Colne Barrier 1999 |
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| 53 | Bacteriological survey : The Wash |
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| 54 | Enhancing the River Tamar |
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| 55 | The Ouse washes (folder) |
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| 56 | The Waterways Bird Survey |
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| 57 | Sussex by the sea |
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| 58 | Review of the findings of the prescribed flow at the Wallers Haven |
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| 59 | The management of the water resources of the Little Ouse groundwater unit |
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| 60 | The management of the water resources of the Lark groundwater unit |
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| 61 | The Thames navigation : charting the future : a consultation document issued by the NRA Thames Region |
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| 62 | The Natural (Baseline) Quality Of Groundwaters In England And Wales. The Chalk Of The South Downs |
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| 63 | The importance of sediment release of phosphorus in the restoration of the Norfolk Broads |
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| 64 | The influx of black magnetic spherules to the lakes of the English Lake District |
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| 65 | The effects of flow reduction in the River Dee on the aquatic environment |
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| 66 | Study into the effect of Chertsey STW on the North Arm of the River Bourne |
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| 67 | The quality of the Humber Estuary 1980-1990 : report of the National Rivers Authority |
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| 68 | The water quality of the Humber Estuary 1992 : a report from The Humber Estuary Committee |
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| 69 | A guide to the interpretation of the electron micrographs contained within the "Ken Clarke Collection" |
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| 70 | Domesday to the dawn of the new millennium : 900 years of the Don Fishery |
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| 71 | The drought of 1995 : a report to the Secretary of State for the Environment |
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| 72 | Back to life : bringing the environment back to the people of the North West |
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| 73 | River in the Dourdogne region |
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| 74 | Meanders in the Amazon River |
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| 75 | Annex to 'achieving the quality' |
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