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New industries of the seventies
Conway, Hobart McKinley, (1978)
Der Wirtschafts- und Handelsfuehrer Rumaeniens
(1982)
Zaire, Upper Volta, Togo, Ivory Coast, Liberia, Gambia, Benin, Guinea, Sierra Leone, Gabon, Senegal, Nigeria, Guinea-Bissau, Cemeroon, Zambia, Ghana
Duic, Walter Zwonimir, (1978)