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1991
January January; 260 (1): E1 - E162	February February; 260 (2): E163 - E332	March March; 260 (3): E333 - E504
April April; 260 (4): E505 - E668	May May; 260 (5): E669 - E809	June June; 260 (6): E811 - E950
July July; 261 (1): E1 - E158, 1	August August; 261 (2): E159 - E292	September September; 261 (3): E293 - E417
October October; 261 (4): E419 - E550	November November; 261 (5): E551 - E676, 1	December December; 261 (6): E677 - E820, 1