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- social aspects (3)
- biomass energy (2)
- conservation and restoration (2)
- cultural property (2)
- historic sites (2)
- literacy (2)
- media literacy (2)
- natural resources (2)
- protection (2)
- technological innovations (2)
- visual literacy (2)
- academic achievement (1)
- africa (1)
- antiquities (1)
- archaeology (1)
- architecture (1)
- arctic regions (1)
- automation (1)
- china (1)
- co-management (1)
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