1968
January January; 61 (1): 1 - 102	February February; 61 (2): 109 - 198	March March; 61 (3): 211 - 324
April April; 61 (4): 335 - 428	May May; 61 (5): 439 - 534	June June; 61 (6): 541 - 630
July July; 61 (7): 639 - 732	August August; 61 (8): 743 - 846	September September; 61 (9): 855 - 947
October October; 61 (10): 955 - 1068	November November; 61 (11): 1075 - 1253	December December; 61 (12): 1255 - 1332