1973
January Vol 51, Num 1: 1 - 167	February Vol 51, Num 2: 169 - 434	March Vol 51, Num 3: 435 - 594
April Vol 51, Num 4: 595 - 812	May Vol 51, Num 5: 813 - 963	June Vol 51, Num 6: 965 - 1120
July Vol 52, Num 1: 1 - 159	August Vol 52, Num 2: 161 - 317	September Vol 52, Num 3: 319 - 482
October Vol 52, Num 4: 483 - 632	November Vol 52, Num 5: 633 - 766	December Vol 52, Num 6: 767 - 899