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The Optimist: Sam Al | |
| ÀúÀÚ | Keach Hagey | ||
| ÃâÆÇ»ç | W. W. Norton & Company | ||
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[RH] Çö´ëÀÎÀÇ »ç¸Á·üÀ» ³ôÀÌ´Â 1 | |
| Àü¹Ì °úÇоÆÄ«µ¥¹Ì(National Academy of Sciences) ȸº¸¿¡ ¹ßÇ¥µÈ »õ·Î¿î .. | ||
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