1981
January January; 37 (1): 1 - 534	February February; 37 (2): 535 - 844	March March; 37 (3): 845 - 1106
April April; 38 (1): 1 - 408	May May; 38 (2): 409 - 803	June June; 38 (3): 805 - 1104
July July; 39 (1): 1 - 329	August August; 39 (2): 331 - 661	September September; 39 (3): 663 - 985
October October; 40 (1): 1 - 334	November November; 40 (2): 335 - 624	December December; 40 (3): 625 - 983