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.