1981
January January; 1 (1): 1 - 81	February February; 1 (2): 83 - 198	March March; 1 (3): 199 - 301
April April; 1 (4): 303 - 386	May May; 1 (5): 387 - 474	June June; 1 (6): 475 - 571
July July; 1 (7): 573 - 671	August August; 1 (8): 673 - 768	September September; 1 (9): 769 - 870
October October; 1 (10): 871 - 960	November November; 1 (11): 961 - 1056	December December; 1 (12): 1057 - 1176