The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth |
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20th century Abelian group addition aesthetic Afghanistan agricultural alcohol algae algebra American Indian ancient animal basin called central centre ceremonial climate coast complex numbers Congo contains Côte d'Ivoire countries crops cultivation culture dance defined desert developed drinking drug East eastern Egypt elements equations European example feet field Figure finite forest function functor Igbo important integers irrigation isomorphism Kabul Kenya Lake Lake Chad Lake Victoria land lattice Lie algebra linear major mapping masks Mexico miles modern Mountains multiplication Niger Nigeria Nile North northern novel patterns percent period plant Plateau polynomial population Pueblo rainfall real numbers region reissued relation ring River Sahara savanna social soils songs South Africa southern Africa species style subgroup Sudan Tanzania theory tion traditional tribes tropical vector space vegetation West Africa western x₁ Yoruba Zambia Zimbabwe