The Western Hills of Peking are,since very remote times,well knownfor coal production and Mentoukou is one of the most productive districts amongthese hills.On account of its economic importance it was visited by several
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C. WANG &Y. S. CHI.1933. THE COAL FIELD OF MENTOUKOU, WEST OF PEIPING[J]. Acta Geologica Sinica(),12(0):
