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1980
January January; 20 (1): 1 - 70	February February; 20 (2): 71 - 164
April April; 20 (4): 165 - 308	May May; 20 (5-6): 309 - 372
July July; 20 (7): 425 - 486	August August; 20 (8): 487 - 551
October October; 20 (10): 553 - 620	November November; 20 (11): 621 - 704