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1968
January January 1968 21 (1): 1 - 133	February February 1968 21 (2): 135 - 192	March March 1968 21 (3): 195 - 251
April April 1968 21 (4): 255 - 334	May May 1968 21 (5): 339 - 525	June June 1968 21 (6): 547 - 698
July July 1968 21 (7): 701 - 784	August August 1968 21 (8): 785 - 882	September September 1968 21 (9): 883 - 1127
October October 1968 21 (10): 1129 - 1222	November November 1968 21 (11): 1225 - 1350	December December 1968 21 (12): 1351 - 1485