In'gong chigu wisŏng sangsik
By: chŏja Haksa Yi Ch'ung-sŏng
Series: Kwahak chisik mun'go -- 90
Publisher: Kwahak Paekkwa Sajŏn Chonghap Ch'ulp'ansa
Published: 1999
Place of publication: [P'yŏngyang]
Language: kor
Number of pages: 96
Subjects: Artificial satellites
Notes: Cover title.