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Extensions and Corrections to the UDC. Series 1. Extension 6. August 1, 1949-December 31, 1952. PE 411-520 Including Rectifications Contained in PE Notes Up to PE 537 of January 8, 1954
Extensions and Corrections to the UDC. Series 4, No.6. P-Notes 659-764 January 1, 1959-December 31, 1961
Extensions and Corrections to the UDC. Series 5, No.6. P-notes 765-823, 831, 832, 834 and 835 published since 1 January 1962 and authorized up to 30 June 1965
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