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- social sciences (8)
- bibliography (4)
- statistical physics (4)
- aerodynamics (3)
- design and construction (3)
- periodicals (3)
- social aspects (3)
- technological innovations (3)
- 研究 (3)
- addresses, essays, lectures (2)
- airplanes (2)
- conservation of natural resources (2)
- directories (2)
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