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Number of Operatives in Various Manufacturing Industries (1921-1930) : Statistical Yearbook of Imperial Japan 51 (1932) Table 77
各種工業職工数 (内地) (大正10年末-昭和5年末) : 日本帝国統計年鑑 51 (昭和7年) 表77
各種工業職工数 (内地) (大正10年末-昭和5年末) : 日本帝国統計年鑑 51 (昭和7年) 表77