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Central African copper-mining industry (1)
Copper industry and trade -- Economic aspects -- Africa, Central (1)
Copper mines and mining -- Economic aspects -- Africa, Central (1)
Corporate profits -- -- Africa, Central (1)
Costs and African advancement (1)
Prices and the color bar (1)
Profits and corporate structure (1)
Race relations -- Africa, Central -- Economic aspects (1)
Wages and technological changes (1)