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1991
January January; 91 (1): 27 - 84	February February; 91 (2): 117 - 182	March March; 91 (3): 218 - 281
April April; 91 (4): 312 - 397	May May; 91 (5): 425 - 491	June June; 91 (6): 526 - 614
July July; 91 (7): 639 - 695	August August; 91 (8): 747 - 813	September September; 91 (9): 857 - 899
October October; 91 (10): 947 - 1005	November November; 91 (11): 1054 - 1147	December December; 91 (12): 1184 - 1223