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2. Effects of mechanized logging in the lowland dipterocarp forest at Lempake, East Kalimantan;Abdulhadi;Malays. For.,1981
3. Exploring the herbarium;Altschul;Sci. Am.,1977
4. Water quality for agriculture;Ayers,1976
5. Amazonian oil-palms of promise: A survey;Balick;Econ. Bot.,1979