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Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971)
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- Nachrichten für Dokumentation. 22(1971), S.55-63
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Wellisch, H.H.: UDC: present and potential (1974)
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Wellisch, H.H.: ¬The Universal Decimal Classification : a programmed instruction course (1970)
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