1.
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[Place of publication not identified] : [publisher not identified], 1999.
Spanish | N 6370(3) UNESCO 3C |
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2.
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[Paris, France] : [UNESCO], 1999.
English | 3B UNESCO |
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3.
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[Paris, France] : [UNESCO], 1999.
French | 3A UNESCO |
|
4.
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[Heidelberg, Germany] : [Springer], 1998.
English | 34 DE |
|