1960
January January; 20 (1): 1 - 146	February February; 20 (2): 147 - 338	March March; 20 (3): 339 - 494
April April; 20 (4): 495 - 664	May May; 20 (5): 665 - 804	June June; 20 (6): 805 - 918
July July; 20 (7): 919 - 1050	August August; 20 (8): 1051 - 1206	September September; 20 (9): 1207 - 1308
October October; 20 (10): 1309 - 1426	November November; 20 (11): 1427 - 1538	December December; 20 (12): 1539 - 1683