1973
January January; 25 (1): 1 - 161	February February; 25 (2): 163 - 324	March March; 25 (3): 325 - 512
April April; 25 (4): 485 - 704.1	May May; 25 (5): 705 - 852	June June; 25 (6): 853 - 1024
July July; 26 (1): 1 - 128	August August; 26 (2): 129 - 222	September September; 26 (3): 223 - 456
October October; 26 (4): 459 - 653	November November; 26 (5): 655 - 832	December December; 26 (6): 833 - 1018