Uri nara chungse kwahak kisulsa
By: [chŏja Yi Yong-tʻae ; pʻyŏnjip Chʻoe Chŏng-gŭn]
Contributors: Chʻoe, Chŏng-gŭn
Publisher: Kwahak Paekkwa Sajŏn Chonghap Chʻulpʻansa
Published: 1990
Place of publication: [Pʻyŏngyang]
Language: kor
Number of pages: 287
Subjects: Technology; History; Science
Notes: Cover title.