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622.34 <1-772> --- 338.45 --- Ontwikkelingslanden --- 622.34 <1-772> Metals and metalloids. Ores (metalliferous minerals)--Onontwikkelde, onderontwikkelde gebieden --- Metals and metalloids. Ores (metalliferous minerals)--Onontwikkelde, onderontwikkelde gebieden --- Industriële economie --- Mineral industries --- Extractive industries --- Extractive industry --- Metal industries --- Mines and mining --- Mining --- Mining industry --- Mining industry and finance --- Industries --- Industrial economics --- Developing countries --- Mineral industries - Developing countries