1968
January January; 95 (1): 1 - 261	February February; 95 (2): 263 - 737	March March; 95 (3): 739 - 1206
April April; 95 (4): 1207 - 1494	May May; 95 (5): 1495 - 1978	June June; 95 (6): 1979 - 2443
July July; 96 (1): 1 - 285	August August; 96 (2): 287 - 574	September September; 96 (3): 575 - 865
October October; 96 (4): 867 - 1454	November November; 96 (5): 1455 - 1888	December December; 96 (6): 1889 - 2190