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Bibliography:
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Lucas, G.L.l. and Synge, H. (compilers) 1978. The IUCN Plant Red Data Book. IUCN, Morges, Switzerland. Miller, A.G. 1992. List of Socotran endemics with conservation status. Revised November 1991 (unpublished). Miller, A.G. 1997. Completed data collection forms and comments concerning the threatened trees of Socotra and Yemen. Oldfield, S., Lusty, C. and MacKinven, A. (compilers) 1998. The World List of Threatened Trees. World Conservation Press, Cambridge, UK.
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