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1991
January January; 70 (1): 1 - 489	February February; 70 (2): 491 - 966	March March; 70 (3): 967 - 1430
April April; 70 (4): 1431 - 1905	May May; 70 (5): 1907 - 2350	June June; 70 (6): 2351 - 2780
July July; 71 (1): 1 - 392	August August; 71 (2): 393 - 794	September September; 71 (3): 795 - 1184
October October; 71 (4): 1185 - 1653	November November; 71 (5): 1655 - 2076	December December; 71 (6): 2077 - 2547