1973
January January; 70 (1): 1 - 154	February February; 70 (2): 155 - 276	March March; 70 (3): 277 - 492
April April; 71 (1): 1 - 154	May May; 71 (2): 155 - 348	June June; 71 (3): 349 - 480
July July; 72 (1): 1 - 140	August August; 72 (2): 141 - 348	September September; 72 (3): 349 - 544
October October; 73 (1): 1 - 264	November November; 73 (2): 265 - 548	December December; 73 (3): 549 - 820