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1980
January January; 55 (1): 1 - 134	February February; 55 (2): 135 - 268	March March; 55 (3): 269 - 402
April April; 55 (4): 403 - 531	May May; 55 (5): 539 - 669	June June; 55 (6): 673 - 769
July July; 56 (1): 1 - 134	August August; 56 (2): 135 - 268	September September; 56 (3): 269 - 402
October October; 56 (4): 403 - 536	November November; 56 (5): 537 - 670	December December; 56 (6): 671 - 787