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1991
January January; 39 (1): 1 - 104	February February; 39 (2): 105 - 266	March March; 39 (3): 267 - 428
April April; 39 (4): 429 - 585	May May; 39 (5): 587 - 689	June June; 39 (6): 691 - 823
July July; 40 (1): 1 - 142	August August; 40 (2): 143 - 332	September September; 40 (3): 333 - 458
October October; 40 (4): 459 - 605	November November; 40 (5): 607 - 867	December December; 40 (6): 869 - 1042