1980
January January; 39 (1): 1 - 279	February February; 39 (2): 281 - 473	March March; 39 (3): 475 - 680
April April; 39 (4): 681 - 936	May May; 39 (5): 937 - 1084	June June; 39 (6): 1085 - 1227
July July; 40 (1): 1 - 178	August August; 40 (2): 179 - 431	September September; 40 (3): 433 - 687
October October; 40 (4): 689 - 854	November November; 40 (5): 855 - 988	December December; 40 (6): 989 - 1151