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1981
January January; 20 (1): 1 - 137	February February; 20 (2): 139 - 279	March March; 20 (3): 1 - 424
April April; 20 (4): 425 - 566	May May; 20 (5): 569 - 704	June June; 20 (6): 705 - 820
July July; 21 (1): 1 - 226	August August; 21 (2): 227 - 365	September September; 21 (3): 369 - 496
October October; 21 (4): 500 - 629	November November; 21 (5): 632 - 769	December December; 21 (6): 771 - 886