1971
January January; 31 (1): 1 - 72	February February; 31 (2): 77 - 207	March March; 31 (3): 209 - 381
April April; 31 (4): 383 - 482	May May; 31 (5): 483 - 724	June June; 31 (6): 725 - 919
July July; 31 (7): 921 - 1059	August August; 31 (8): 1061 - 1172	September September; 31 (9): 1173 - 1318
October October; 31 (10): 1319 - 1521	November November; 31 (11): 1523 - 1872	December December; 31 (12): 1875 - 2199