1968
January January; 16 (1): 1 - 185	February February; 16 (2): 187 - 440	March March; 16 (3): 441 - 547
April April; 16 (4): 549 - 668	May May; 16 (5): 669 - 818	June June; 16 (6): 819 - 964
July July; 16 (7): 965 - 1103	August August; 16 (8): 1105 - 1262.1	September September; 16 (9): 1265 - 1438
October October; 16 (10): 1439 - 1634	November November; 16 (11): 1635 - 1813	December December; 16 (12): 1815 - 1956