Kŏnʼgang kwa changsu
By: [chŏja Kim Chong-yŏng ; simsaja Pak Sŏn-ok].
Publisher: Kwahak, Paekkwa Sajŏn Chʻulpʻansa
Published: 1983
Place of publication: [Pʻyŏngyang]
Language: kor
Number of pages: 200
Subjects: Middle-aged persons -- Health and hygiene; Longevity