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41by Meeting on Education concerning the Problems associated with the Use of Drugs in Ten Countries of Asia, Penang, Malaysia, 1977, Lê Thành Khôiprogramme and meeting document bibliotecaUNESCO
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42by Meeting on Education concerning the Problems associated with the Use of Drugs in Ten Countries of Asia, Penang, Malaysia, 1977, Lê Thành Khôiprogramme and meeting document bibliotecaUNESCO
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43by Round Table of Specialists on Out-of-school Education Programmes in Sub-Saharan Africa, Dakar, 1972, UNESCO Regional Office for Education in Africa (Senegal), Lê Thành Khôi, Eteki-Mboumoua, William Aurélien, Lê Thi Nam Tran, Cassen, B.programme and meeting document bibliotecaUNESCO