51 | Database and atlas of aquatic vascular plants in the British Isles : part 2 : distribution maps (352/2/N and Y) |
52 | The faunal richness of headwater streams. Stage 3 : impact of agricultural activities. Volume 2 : appendices (Note 392) |
53 | East Devon public water supply strategy : the existence and potential use in yield analysis of historic flow records |
54 | 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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55 | Micro low flows average and low flow estimation in the SW region : validation of version 1.2 software |
56 | Library and information services of the Instituto de Investigacao Pesqueiras, Angola. Report of a two week consultancy 20 July to 3 August |