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1991
January January; 4 (1): 5 - 127	February February; 4 (2): 137 - 253
March March; 4 (3): 257 - 380	April April; 4 (4): 385 - 511
May May; 4 (5): 517 - 633	June June; 4 (6): 639 - 766
July July; 4 (7): 771 - 911	September September; 4 (8): 917 - 1036
October October; 4 (9): 1041 - 1152	November November; 4 (10): 1159 - 1308