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Injury and Sickness Assistance for Miners (1933) : Statistical Yearbook of Imperial Japan 53 (1934) Table 209
鉱夫傷病扶助 (内地) (昭和8年) : 日本帝国統計年鑑 53 (昭和9年) 表209
鉱夫傷病扶助 (内地) (昭和8年) : 日本帝国統計年鑑 53 (昭和9年) 表209