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1981
January January; 79 (1): 1 - 128	February February; 79 (2): 129 - 244	March March; 79 (3): 253 - 372
April April; 79 (4): 377 - 496,        1S - 136S	May May; 79 (5): 497 - 616	June June; 79 (6): 617 - 718
July July; 80 (1): 1 - 120	August August; 80 (2): 121 - 250	September September; 80 (3): 251 - 336
October October; 80 (4): 389 - 524	November November; 80 (5): 525 - 656	December December; 80 (6): 657 - 924