1981
January January; 108 (1): 1 - 360	February February; 108 (2): 371 - 735	March March; 108 (3): 741 - 1108
April April; 108 (4): 1115 - 1603	May May; 108 (5): 1607 - 2027	June June; 108 (6): 2033 - 2411
July July; 109 (1): 1 - 343	August August; 109 (2): 345 - 683	September September; 109 (3): 685 - 1003
October October; 109 (4): 1005 - 1319	November November; 109 (5): 1321 - 1804	December December; 109 (6): 1805 - 2306