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1990
January January; 420 (1): 1 - 493 January; 420 (Suppl): 1P - 156P January; 422 (Suppl): 1P - 105P January; 423 (Suppl): 1P - 110P January; 424 (Suppl): 1P - 72P January; 425 (Suppl): 1P - 93P January; 426 (Suppl): 1P - 122P January; 427 (Suppl): 1P - 60P January; 429 (Suppl): 1P - 133P January; 430 (Suppl): 1P - 149P	February February; 421 (1): 1 - 662	March March; 422 (1): 1 - 602
April April; 423 (1): 1 - 675	May May; 424 (1): 1 - 563	June June; 425 (1): 1 - 626
July July; 426 (1): 1 - 521	August August; 427 (1): 1 - 713	September September; 428 (1): 1 - 764
October October; 429 (1): 1 - 568	November November; 430 (1): 1 - 618	December December; 431 (1): 1 - 757