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1981
January January; 240 (1): 1 - 81	February February; 240 (2): 83 - 157	March March; 240 (3): 159 - 254
April April; 240 (4): 257 - 351	May May; 240 (5): F353 - F355	June June; 240 (6): 471 - 576
July July; 241 (1): 1 - 104	August August; 241 (2): 105 - 200	September September; 241 (3): 203 - 332
October October; 241 (4): 333 - 467	November November; 241 (5): 469 - 578	December December; 241 (6): F691 - F691