General conference twentieth session 1978 : proceedings.
- Paris : Unesco, c 1980.
- Vols. : ill. ; 29 cm.
V. 3-- ;
11 11
English, French, Spanish, Russian, Arabic
92-3-001776-0
General Conference-- Unesco.
060 / U3r
V. 3-- ;
11 11
English, French, Spanish, Russian, Arabic
92-3-001776-0
General Conference-- Unesco.
060 / U3r