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Technical Supplementary Schools (FY 1931) : Statistical Yearbook of Imperial Japan 53 (1934) Table 238
実業補習学校 (昭和6年度) : 日本帝国統計年鑑 53 (昭和9年) 表238
実業補習学校 (昭和6年度) : 日本帝国統計年鑑 53 (昭和9年) 表238