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1957
January 1 January; 224 (1): 1 - 620	February 1 February; 224 (2): 621 - 1127	March 1 March; 225 (1): 1 - 573
April 1 April; 225 (2): 575 - 1069	May 1 May; 226 (1): 1 - 571	June 1 June; 226 (2): 573 - 1101
July 1 July; 227 (1): 1 - 550	August 1 August; 227 (2): 551 - 1116	September 1 September; 228 (1): 1 - 546
October 1 October; 228 (2): 547 - 1062	November 1 November; 229 (1): 1 - 546	December 1 December; 229 (2): 547 - 1103