http://purl.org/dc/terms/source
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https://collection.rcgs.jp/resource/PACKAGE0001432
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https://collection.rcgs.jp/resource/PACKAGE0002934
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https://ja.wikipedia.org/wiki/エンジェル_(曖昧さ回避) (accessed 2018-10-25)
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https://ja.wikipedia.org/wiki/メガハウス (accessed 2018-10-25)
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https://www.mobygames.com/company/angel (accessed 2018-10-25)
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https://www.mobygames.com/company/megahouse-corporation (accessed 2018-10-25)
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