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Article
E. Cowley, AuteurThis work examines the retrap rate in subsequent years of Sand Martins Riparia riparia ringed as juveniles in colonies in Nottinghamshire from 1969 to 1991. It shows that the weight of juveniles fledging with primaries still partially in pin fel[...]
Article
E. Cowley, Auteur8,037 examinations were made of brood patches of Sand Martins from 1971 to 1992 in north Nottinghamshire and given one of 12 different descriptions. The 1,997 birds which were examined more than once (5,443 times in total) and identified as, 1,0[...]
