Chungso kiŏp siltʻae chosa pogo :
chejoŏp, kwangŏp, unsuŏp 1966 /
[chosabujang Chʻoe Chun-jŏng pʻyŏnjip.

ä¸­å°ä¼æ¥­å¯¦æ…‹èª¿æŸ¥å ±å‘Š : è£½é€ æ¥­, 鑛業, 運輸業 1966

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