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1990
January January; 49 (1): 7 - 170	February February; 49 (2): 177 - 343	March March; 49 (3): 345 - 512
April April; 49 (4): 515 - 688	May May; 49 (5): 689 - 854	June June; 49 (6): 861 - 1027
July July; 50 (1): 1 - 167	August August; 50 (2): 173 - 337	September September; 50 (3): 343 - 514
October October; 50 (4): 519 - 688	November November; 50 (5): 689 - 860	December December; 50 (6): 862 - 1023