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1991
January January; 49 (1): 1 - 103	February February; 49 (2): 107 - 213	March March; 49 (3): 217 - 312
April April; 49 (4): 317 - 422	May May; 49 (5): 427 - 525	June June; 49 (6): 533 - 629
July July; 50 (1): 1 - 103	August August; 50 (2): 109 - 207	September September; 50 (3): 215 - 316
October October; 50 (4): 321 - 422	November November; 50 (5): 423 - 528	December December; 50 (6): 529 - 640