1968
January Vol 41, Num 1: 1 - 378	February Vol 41, Num 2: 379 - 546	March Vol 41, Num 3: 547 - 706
April Vol 41, Num 4: 707 - 866	May Vol 41, Num 5: 867 - 1026	June Vol 41, Num 6: 1027 - 1162
July Vol 42, Num 1: 1 - 224	August Vol 42, Num 2: 225 - 389	September Vol 42, Num 3: 391 - 562
October Vol 42, Num 4: 563 - 726	November Vol 42, Num 5: 727 - 886	December Vol 42, Num 6: 887 - 1026