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The ABC of copyright
- 346.0482 A11111
- UNESCO,
- 1981.
- Paris :
-
New horizons of human knowledge : a series of public talks given at Unesco / Subrahmanyan Chandrasekhar ... [et al.] ; with an introduction by Amadou-Mahtar M'Bow.
- 500 N53211
- UNESCO Press,
- 1981.
- Paris :
-
In defence of the earth : the basic texts on environment : Founex, Stockholm, Cocoyoc.
- 363.70526 D3132
- United Nations Environment Programme,
- 1981.
- Nairobi