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Biblioteca UTCB
International Federation for Documentation
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Extensions and Corrections to the UDC. Series 2, No.6 : 1953-1955
Extensions and Corrections to the UDC. Series 3, No.6 : 1956-1958
Extensions and Corrections to the UDC. Series 7, No.6, 1968-70, proposals authorized by June 1971
Extensions and Corrections to the UDC. Series 8, No.5/6 : 1971-1973 proposals
Extensions and Corrections to the UDC. Series 9, No.3 : 1974-1976
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