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1991
January January; 77 (1): 1 - 170	February February; 77 (2): 171 - 330	March March; 77 (3): 331 - 492
April April; 77 (4): 493 - 652	May May; 77 (5): 653 - 810	June June; 77 (6): 811 - 1014
July July; 78 (1): 1 - 160	August August; 78 (2): 161 - 322	September September; 78 (3): 323 - 480
October October; 78 (4): 573 - 730	November November; 78 (5): 731 - 888 November; 78 (5_Part_2): 890 - 988	December December; 78 (6): 991 - 1178