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1991
January January; 137 (1): 1 - 217	February February; 137 (2): 219 - 440	March March; 137 (3): 441 - 724
April April; 137 (4): 725 - 1008	May May; 137 (5): 1009 - 1230	June June; 137 (6): 1231 - 1452
July July; 137 (7): 1453 - 1764	August August; 137 (8): 1765 - 2049	September September; 137 (9): 2051 - 2272
October October; 137 (10): 2273 - 2491	November November; 137 (11): 2493 - 2679	December December; 137 (12): 2681 - 2918