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1991
January January; 432 (1): 1 - 710 January; 438 (1): 1P - 374P January; 440 (1): 1 - 771 January; 432 (Suppl): 1P - 44P January; 434 (Suppl): 1P - 97P January; 435 (Suppl): 1P - 118P January; 431 (Index vols 395-431): 1 - 689	February February; 433 (1): 1 - 765	March March; 434 (1): 1 - 660
April April; 435 (1): 1 - 646	May May; 436 (1): 1 - 771	June June; 437 (1): 1 - 765
August August; 439 (1): 1 - 768	September September; 441 (1): 1 - 778	October October; 442 (1): 1 - 780
November November; 443 (1): 1 - 779	December December; 444 (1): 1 - 778