1980
January January; 27 (1): 1 - 282	February February; 27 (2): 283 - 705	March March; 27 (3): 707 - 1040
April April; 28 (1): 1 - 301	May May; 28 (2): 303 - 647	June June; 28 (3): 649 - 1053
July July; 29 (1): 1 - 293	August August; 29 (2): 295 - 835	September September; 29 (3): 837 - 1204
October October; 30 (1): 1 - 319	November November; 30 (2): 321 - 620	December December; 30 (3): 621 - 901