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Manganese Ores
Curtis, A. H., (1919)
Mercury Ores
Halse, Edward, (1923)
The iron deposits of the union of South Africa
Wagner, Percy Albert, (1928)
Antimony ores
Halse, Edward, (1925)
Mercury ores : with map
Cobalt ores : with a map
Halse, Edward, (1924)