1973
January January; 11 (1): 1 - 155	February February; 11 (2): 157 - 351	March March; 11 (3): 353 - 463
April April; 11 (4): 465 - 615	May May; 11 (5): 615 - 814	June June; 11 (6): 815 - 1030
July July; 12 (1): 1 - 201	August August; 12 (2): 203 - 420	September September; 12 (3): 421 - 669
October October; 12 (4): 669 - 949	November November; 12 (5): 951 - 1194	December December; 12 (6): 1195 - 1632