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1991
January January; 122 (1): 14 - 160	February February; 122 (2): 8 - 120	March March; 122 (3): 10 - 97
April April; 122 (4): 8 - 96	May May; 122 (5): 10 - 138	June June; 122 (6): 8 - 96
July July; 122 (7): 13 - 198 Supplement: 1 - 14	August August; 122 (8): 11 - 130	September September; 122 (9): 10 - 120
October October; 122 (10): 8 - 96	November November; 122 (11): 8 - 96	December December; 122 (12): 8 - 80