1981
January January; 41 (1): 1 - 336	February February; 41 (2): 337 - 561	March March; 41 (3): 563 - 847
April April; 41 (4): 849 - 1082	May May; 41 (5): 1083 - 1287	June June; 41 (6): 1289 - 1486
July July; 42 (1): 1 - 185	August August; 42 (2): 187 - 387	September September; 42 (3): 389 - 563
October October; 42 (4): 565 - 749	November November; 42 (5): 751 - 928	December December; 42 (6): 929 - 1134