1973
January January; 73 (1): 1 - 159	February February; 73 (2): 161 - 366	March March; 73 (3): 367 - 530
April April; 73 (4): 531 - 735	May May; 74 (1): 1 - 195	June June; 74 (2): 197 - 383
July July; 74 (3): 385 - 542	August August; 74 (4): 543 - 733	September September; 75 (1): 1 - 219
October October; 75 (2): 221 - 421	November November; 75 (3): 423 - 577	December December; 75 (4): 579 - 756