1981
January January; 13 (1): 1 - 243	February February; 13 (2): 245 - 400	March March; 13 (3): 401 - 608
April April; 13 (4): 609 - 810	May May; 13 (5): 811 - 1009	June June; 13 (6): 1011 - 1125
July July; 14 (1): 1 - 121	August August; 14 (2): 123 - 236	September September; 14 (3): 237 - 354
October October; 14 (4): 355 - 462	November November; 14 (5): 463 - 597	December December; 14 (6): 599 - 713