1989
January January; 20 (1): 1 - 129	February February; 20 (2): 173 - 301	March March; 20 (3): 317 - 428
April April; 20 (4): 441 - 561	May May; 20 (5): 575 - 701	June June; 20 (6): 715 - 828
July July; 20 (7): 841 - 969	August August; 20 (8): 983 - 1117	September September; 20 (9): 1133 - 1290
October October; 20 (10): 1305 - 1434	November November; 20 (11): 1449 - 1593	December December; 20 (12): 1607 - 1756