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2. Ultramafic (serpentinitic) mineralogy class;Alexander,1985
3. Soils of the humid tropics;Baillie,1996
4. Hyperaccumulation of nickel by the flora of the ultramafics of Palawan, Republic of the Philippines;Baker,1992
5. BGM and UNDP, 1985. Geology of Central Palawan. Technical Report DP/UN/PH-79-004/6. Bureau of Geosciences and Mines, Manila, and United Nations Development Programme, New York.