Lloyd, G.A.: ¬The Universal Decimal Classification as an international switching language (1972)
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- Source
- Subject retrieval in the seventies: new directions. Proc. of an Int. Symp. ... College Park, May 14-15, 1971. Ed.: H.H. Wellisch et al
Lloyd, G.A.: Universal Decimal Classification (1976)
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- Source
- Classification in the 1970s: a second look. Rev. ed. Ed.: A. Maltby