1999
January January; 181 (1): 1 - 356 January; 181 (2): 357 - 695	February February; 181 (3): 697 - 1058 February; 181 (4): 1059 - 1373	March March; 181 (5): 1375 - 1702 March; 181 (6): 1703 - 1974
April April; 181 (7): 1975 - 2313 April; 181 (8): 2315 - 2665	May May; 181 (9): 2667 - 2986 May; 181 (10): 2987 - 3316	June June; 181 (11): 3317 - 3612 June; 181 (12): 3613 - 3868
July July; 181 (13): 3869 - 4141 July; 181 (14): 4143 - 4442	August August; 181 (15): 4443 - 4723 August; 181 (16): 4725 - 5134	September September; 181 (17): 5135 - 5541 September; 181 (18): 5543 - 5889
October October; 181 (19): 5891 - 6222 October; 181 (20): 6223 - 6572	November November; 181 (21): 6573 - 6856 November; 181 (22): 6857 - 7148	December December; 181 (23): 7149 - 7404 December; 181 (24): 7405 - 7650