1961
January January; 21 (1): 1 - 118	February February; 21 (2): 119 - 230	March March; 21 (3): 231 - 360
April April; 21 (4): 361 - 490	May May; 21 (5): 491 - 602	June June; 21 (6): 603 - 752
July July; 21 (7): 753 - 878	August August; 21 (8): 879 - 1022	September September; 21 (9): 1023 - 1196
October October; 21 (10): 1197 - 1344	November November; 21 (11): 1345 - 1510	December December; 21 (12): 1522 - 1656