Low-cost science and technology materials at the primary school level :

Low-cost science and technology materials at the primary school level : exampleof national institutions of Democratic People's Republic ofKorea, People's Republic of China and Brasilia. - Korea : Ministry of Foreing Affairs; National Commission for Unesco, 1990. - 60 p. ; il.

372.8: 373.3 =20 "1990" LOW.