Hanʼguk ŭi kwahak munhwajae
By: Chŏn Sang-un chiŭm
Edition: Chʻŏtpʻan
Publisher: Chŏngŭmsa
Published: 1987
Place of publication: Sŏul Tʻŭkpyŏlsi
Language: kor
Number of pages: 155
Subjects: Science; Technology