their efficient organization and management Duyvis, F. Donker creator Schippers, M. E. United Nations Educational Scientific and Cultural Organization (UNESCO) text fr France UNESCO 1961 monographic eng Eng

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23 p. : 20 cm. F. Donker Duyvis; M. E. Schippers Includes bibliographical references and index. Library & information science Reproduction services 020 UNESCO BD-DhIDS 260520 20260520121508.0