1989
January January; 23 (1): 2 - 105	February February; 23 (2): 108 - 206	March March; 23 (3): 208 - 305
April April; 23 (4): 308 - 431	May May; 23 (5): 434 - 534	June June; 23 (6): 536 - 639
July July; 23 (7): 642 - 754	August August; 23 (8): 756 - 860	September September; 23 (9): 862 - 975
October October; 23 (10): 978 - 1080	November November; 23 (11): 1082 - 1197	December December; 23 (12): 1200 - 1291