1968
January January; 38 (1): 1 - 108	February February; 38 (2): 109 - 210	March March; 38 (3): 211 - 320
April April; 38 (4): 321 - 446	May May; 38 (5): 447 - 560	June June; 38 (6): 561 - 678
July July; 38 (7): 679 - 772	August August 1968; 38 (8): 773 - 878	September September; 38 (9): 879 - 976
October October; 38 (10): 977 - 1073	November November; 38 (11): 1075 - 1148	December December; 38 (12): 1149 - 1211