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Aebischer, Nicholas J., Evans, A.D., Grice, P.V., Vickery, Juliet A. , 2000. Ecology and conservation of lowland farmland birds : Proceedings of the 1999 British Ornithologists' Union Spring Conference ... held at the University of Southampton, UK on 27-28 March 1999. British Ornithologists' Union, Tring, Herts., UK. 182 pp.