1973
January January; 3 (1): 1 - 142	February February; 3 (2): 143 - 313	March March; 3 (3): 315 - 444
April April; 3 (4): 445 - 535	May May; 3 (5): 537 - 647	June June; 3 (6): 649 - 743
July July; 4 (1): 1 - 72	August August; 4 (2): 73 - 200	September September; 4 (3): 201 - 382
October October; 4 (4): 383 - 500	November November; 4 (5): 501 - 588	December December; 4 (6): 589 - 649