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1991
January January; 55 (1): 1 - 126	February February; 55 (2): 138 - 174	March March; 55 (3): 187 - 227
April April; 55 (4): 235 - 281	May May; 55 (5): 295 - 337	June June; 55 (6): 347 - 383
July July; 55 (7): 391 - 497	August August; 55 (8): 502 - 545	September September; 55 (9): 558 - 627
October October; 55 (10): 640 - 697	November November; 55 (11): 708 - 753	December December; 55 (12): 768 - 816