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1981
January January; 216 (1): 1 - 204	February February; 216 (2): 205 - 431	March March; 216 (3): 433 - 653
April April; 217 (1): 1 - 234	May May; 217 (2): 235 - 535	June June; 217 (3): 537 - 871
July July; 218 (1): 1 - 302	August August; 218 (2): 303 - 574	September September; 218 (3): 575 - 815
October October; 219 (1): 1 - 280	November November; 219 (2): 281 - 584	December December; 219 (3): 585 - 827