1973
January January; 20 (1): 1 - 40	February February; 20 (2): 37 - 71	March March; 20 (3): 9 - 105
April April; 20 (4): 45 - 144	May May; 20 (5): 49 - 180	June June; 20 (6): 53 - 215
July July; 21 (1): 1 - 60	August August; 21 (2): 33 - 64	September September; 21 (3): 65 - 95
October October; 21 (4): 69 - 127	November November; 21 (5): 73 - 158	December December; 21 (6): 77 - 184