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Mineral industries --- Iron mines and mining --- Coal mines and mining
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Gold mines and mining --- Geology, Economic --- Geology --- Gold mines and mining. --- Alaska.
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Gold. --- Currency question. --- Gold mines and mining --- Witwatersrand (South Africa)
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Gold mines and mining --- Geology, Economic --- Geology --- Alaska.
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Mines and mining --- Metallurgy, Belgium, 1913-18. --- World War, 1914-1918 --- Economic aspects, Belgium.
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Coal mines and mining --- World War, 1914-1918 --- Territorial questions --- Saar Valley
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