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Thinking ahead : Unesco and the challenges of today and tomorrow.
- 341.767 U567t
- Unesco.
- UNESCO,
- 1977.
- Paris :
-
Youth in a changing world : an analysis of Unesco's youth programme between 1969 and 1977.
- 305.235 U567
- Unesco.
- Unesco],
- 1977.
- [S.l. :