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1Sangyō keizai tsūshinroku (Kantō-ban) Shōwa 32-nendo kōki hen產業経済通信錄(関東版) 昭和32年度後期編Published 1957
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2Kita Kantō no chūken 100-sha = 100 major companies in Ibaraki, Tochigi & Gunma /北関東の中堅100社 = 100 major companies in Ibaraki, Tochigi & Gunma /Published 1982
Book