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Reynolds, D.J.: ¬The introduction and use of forms of decimal classification in Russia, 1895-1921 : UDC, DDC, and the normal plan (1977)
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Wellisch, H.H.: UDC: present and potential (1974)
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Lloyd, G.A.: ¬The Universal Decimal Classification as an international switching language (1972)
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Lloyd, G.A.: Universal Decimal Classification (1976)
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Dahlberg, I.: Major developments in classification (1977)
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