Low-cost science and technology materials at the senior middle school lower grades level :
Low-cost science and technology materials at the senior middle school lower grades level : examples of national institutions of Democratic People's Republic of Korea, People's Republic of China and Brasilia.
- Korea : Ministry of Foreing Affairs; National Commission for UNESCO, 1990.
- 47 p. ; il.
372.8: 375.5 =20 "1990" LOW.
372.8: 375.5 =20 "1990" LOW.