31. C.J. Humphries, J.R. Press y D.A Sutton (1989). The Hamlyn Press to trees of Britain and Europe. Hamlyn: London, pp. 50-51.
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31. C.J. Humphries, J.R. Press y D.A Sutton (1989). The Hamlyn Press to trees of Britain and Europe. Hamlyn: London, pp. 50-51. |