| 51 | The National Centre for Environmental Data and Surveillance : annual report April 1998 - April 1999 |
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| 52 | Quantification of the relationship between effluent quality and biological quality : interim report for stage 1 |
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| 53 | Biological characteristics and exploitation of sea trout in the River Tywi during 1989 |
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| 54 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 55 | Report on two electrofishing surveys carried out between July 10-25 1978 and July 9-12 1979 on the proposed Kielder Water
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| 56 | The faunal richness of headwater streams. Stage 3 : impact of agricultural activities. Volume 2 : appendices (Note 392) |
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| 57 | Micro low flows average and low flows estimation in the SW region : validation of regional version 1.1 software |
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| 58 | Micro low flows average and low flows estimation in the SW region : validation of regional version 1.3 software |
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| 59 | East Devon public water supply strategy : the existence and potential use in yield analysis of historic flow records |
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| 60 | Micro low flows average and low flow estimation in the SW region : validation of version 1.2 software |
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| 61 | Database and atlas of aquatic vascular plants in the British Isles : part 2 : distribution maps (352/2/N and Y) |
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| 62 | Anglian radar information project : report no. 5 : quantitative precipitation estimation with weather radar : problems and solutions for the National Rivers Authority |
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| 63 | Library and information services of the Instituto de Investigacao Pesqueiras, Angola. Report of a two week consultancy 20 July to 3 August |
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| 64 | Report on the millennium chalk streams fly trends study : a survey carried out in 2000 among 365 fly fishermen, fishery owners, club secretaries and river keepers |
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