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1990
January January; 68 (1): 1 - 440	February February; 68 (2): 441 - 831	March March; 68 (3): 833 - 1304
April April; 68 (4): 1305 - 1775	May May; 68 (5): 1777 - 2249	June June; 68 (6): 2267 - 2674
July July; 69 (1): 1 - 406	August August; 69 (2): 407 - 808	September September; 69 (3): 809 - 1200
October October; 69 (4): 1201 - 1564	November November; 69 (5): 1565 - 1934	December December; 69 (6): 1935 - 2332