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1991
January January; 31 (1): 1 - 94	February February; 31 (2): 97 - 190	March March; 31 (3): 197 - 291
April April; 31 (4): 297 - 392	May May; 31 (5): 395 - 489	June June; 31 (6): 491 - 586
July July; 31 (7): 587 - 680	August August; 31 (8): 683 - 777	September September; 31 (9): 779 - 871
October October; 31 (10): 877 - 1040	November November; 31 (11): 1043 - 1117	December December; 31 (12): 1119 - 1160