http://purl.org/dc/terms/source
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https://collection.rcgs.jp/resource/PACKAGE0003275
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https://ja.wikipedia.org/wiki/伊藤忠商事 (accessed 2018-10-25)
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https://www.itochu.co.jp/ja/ (accessed 2018-10-25)
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https://www.mobygames.com/company/itochu-corporation (accessed 2018-10-25)
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