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Subject retrieval in the seventies: new directions : Proc. of an Int. Symp. ... College Park, 14.-15.5.1971 (1972)
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Proceedings of first seminar on UDC in a mechanized retrieval system, conducted by R.R. Freeman u. P. Atherton, Copenhagen, 2.-6.9.1968 (1969)
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Proceedings of second seminar on UDC in a mechanized retrieval system, conducted by R.R. Freeman, Frankfurt, 1.-5.6.1970. (1971)
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Classification in the 1970s. A second look (1976)
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Major classification systems: the Dewey centennial : papers presented at the Allerton Park Institute, 9.-12.11.1975 (1976)
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General Classification Systems in a changing world : Proceedings of the FID Classification Symposium held in commemoration of the Dewey centenary, Brussels, Nov. 1976 (1978)
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UDC in relation to other indexing languages : Proceedings of the International Symposium held in Herceg Novi, Yugoslavia, 28.6.-1.7.1971 (1975)
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Extensions and corrections to the UDC : 1993 (1993)
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Classification : options and opportunities (1995)
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¬The UDC : Essays for a new decade (1990)
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