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1989
January January; 89 (1): 1 - 385	February February; 89 (2): 387 - 717	March March; 89 (3): 719 - 1019c
April April; 89 (4): 1021 - 1412	May May; 90 (1): 1 - 365	June June; 90 (2): 367 - 777
July July; 90 (3): 779 - 1231	August August; 90 (4): 1233 - 1649	September September; 91 (1): 1 - 449
October October; 91 (2): 451 - 794	November November; 91 (3): 795 - 1238	December December; 91 (4): 1239 - 1632c