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1968
January January; 55 (1): 1 - 148	February February; 55 (2): 149 - 298	March March; 55 (3): 299 - 451
April April; 55 (4): 457 - 604	May May; 55 (5): 605 - 762	June June; 55 (6): 763 - 894
July July; 56 (1): 1 - 152	August August; 56 (2): 155 - 304	September September; 56 (3): 307 - 434
October October; 56 (4): 457 - 608	November November; 56 (5): 611 - 764	December December; 56 (6): 767 - 892