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1991
January January; 71 (1): 1 - 67	February February; 71 (2): 88 - 169	March March; 71 (3): 181 - 259
April April; 71 (4): 270 - 346	May May; 71 (5): 364 - 414	June June; 71 (6): 431 - 491
July July; 71 (7): 498 - 542	August August; 71 (8): 554 - 624	September September; 71 (9): 637 - 686
October October; 71 (10): 703 - 765	November November; 71 (11): 789 - 856	December December; 71 (12): 875 - 996