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2Kwahak kisul yongŏjip : <hanggong konghakpʻyŏn>과학기술용어집 : 〈항공공학편〉Published 1970
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3UFO wa ch'o chayŏn ŭi kongp'o /UFO 와 超 自然 의 恐怖 /by Berlitz, Charles, 1914-2003
Published 1976
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