The New Encyclopædia BritannicaEncyclopaedia Britannica, Incorporated, 1987 - Encyclopedias and dictionaries |
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20th century Abelian group addition adhesives Afghanistan agricultural Albanian alcohol algebra animal associated Bantu Basin British called carved cement central centre ceremonial climate coast colonial common complex numbers Congo contains countries crops cultivation culture dance defined desert developed drinking drug East eastern economic Egypt elements equations European example farm feet field figures finite fish forest functor Ghana important Indians integers irrigation isomorphism Kenya Lake Lake Victoria land lattice Lie algebra linear major mapping masks miles modern mountains Mozambique multiplication Niger Niger River Nigeria Nile northern operations patterns percent period Plains plant Plateau polynomial population rainfall real numbers region ring river Sahara savanna sculpture social society soil South Africa southern subgroup Sudan theory tion trade traditional tribes United Valley vector space vegetation village West Africa western Yoruba Zaire Zimbabwe