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6Published 1972Conference Proceeding Book
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7Published 1985Conference Proceeding Book
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12Published 1987Conference Proceeding Book
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13Published 1990Conference Proceeding Book
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14Published 1971“...United Nations Educational, Scientific and Cultural Organization. National resources research,...”
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15Published 1968“...[United Nations Educational, Scientific and Cultural Organization. Document] CLT.66/X.11...”
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