1981
January January; 97 (1): 1 - 235	February February; 97 (2): 237 - 494
March March; 97 (3-4): 495 - 737	May May; 98 (1): 1 - 238
June June; 98 (2): 239 - 466	July July; 98 (3): 467 - 675
August August; 98 (4): 677 - 869	September September; 99 (1): 1 - 181
October October; 99 (2): 183 - 369	November November; 99 (3-4): 371 - 571