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- conservation of natural resources (2)
- economic history (2)
- food supply (2)
- international relations (2)
- power resources (2)
- technological innovations (2)
- bric countries (1)
- 情報検索 (1)
- 情報管理 (1)
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出版社:
Institute of Transportation Studies, University of California,
出版日期: 1979.
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