1981
January January; 54 (637): 1 - 80	February February; 54 (638): 91 - 173	March March; 54 (639): 179 - 270
April April; 54 (640): 277 - 366	May May; 54 (641): 377 - 435	June June; 54 (642): 443 - 550
July July; 54 (643): 555 - 639	August August; 54 (644): 643 - 698	September September; 54 (645): 719 - 821
October October; 54 (646): 831 - 924	November November; 54 (647): 927 - 1013	December December; 54 (648): 1027 - 1116