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| 公开/私有: | 公开 私有 |
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- environmental policy (29)
- environmental sciences (29)
- environmentalism (17)
- environmental protection (15)
- 東洋学 -- 書目 (14)
- social aspects (12)
- philosophy (11)
- 中国 -- 歴史 (11)
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- 東南アジア (7)
- 東南アジア -- 地誌 (7)
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