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1981
January January; 240 (1): H1 - H1	February February; 240 (2): 149 - 313	March March; 240 (3): 315 - 429
April April; 240 (4): 431 - 679	May May; 240 (5): H681 - H683	June June; 240 (6): H983 - H983
July July; 241 (1): 1 - 116	August August; 241 (2): 117 - 287	September September; 241 (3): H289 - H290
October October; 241 (4): 459 - 661	November November; 241 (5): 663 - 782	December December; 241 (6): H894 - H894