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1Yŏhaeng-gwa kaehyŏk, kŭrigo 18 segi Chosŏn ŭi kwahak kisul = Travel, statecraft reform, and science and technology in eighteenth-century Korea /여행 과 개혁, 그리고 18 세기 조선 의 과학 기술 = Travel, statecraft reform, and science and technology in eighteenth-century Korea /
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