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Guide to the Universal Decimal Classification (UDC) / [British Standards Institution].

Decimal, Universal Decimal, and Colon Classification / A.A.N. Raju.

Classification Décimale Universelle : Universal decimal classification for use in public libraries / compiled by Brian Roberts.

Universal decimal classification (B.S. 1000A : 1961) : abridged English edition prepared by the B.S.I. under the auspices of the International Federation of documentation and with the concurrence of the Lake Placid club education foundation, New York

Universal decimal classification / prepared by the B.S.I. under the auspices of the International Federation for Documentation (F.I.D.) and with the concurrence of the Lake Placid Club Education Foundation, New York.