1961
January January; 21 (1): 1 - 136	February February; 21 (2): 137 - 294	April April; 21 (3): 295 - 428
May May; 21 (4): 429 - 580	June June; 21 (5): 581 - 715	July July; 21 (6): 717 - 827
August August; 21 (7): 829 - 956	September September; 21 (8): 957 - 1075	October October; 21 (9): 1077 - 1329
November November; 21 (10): 1331 - 1474	December December; 21 (11): 1475 - 1596