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21. | political books |
| 政治书籍 |
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22. | book publishers'catalogue |
| 书籍出版社目录 |
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23. | agricultural books |
| 农业书籍 |
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24. | Books, audio & video products |
| 书籍音像 |
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25. | out-of-print publications |
| 绝版书籍 |
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26. | popular science books |
| 科普书籍 |
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27. | scientific book |
| 科学书籍 |
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28. | bibliophilist n. |
| 书籍收藏家 |
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29. | learned books |
| 学术性书籍 |
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30. | Check out books. |
| 借出书籍 |
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