1991
January January; 65 (1): 1 - 556	February February; 65 (2): 557 - i4	March March; 65 (3): 1053 - 1666
April April; 65 (4): 1667 - 2154	May May; 65 (5): 2155 - 2765	June June; 65 (6): 2767 - 3415
July July; 65 (7): 3417 - 3972	August August; 65 (8): 3973 - 4554	September September; 65 (9): 4555 - 5130
October October; 65 (10): 5131 - 5656	November November; 65 (11): 5657 - 6379	December December; 65 (12): 6381 - 7086