1980
January January; 17 (1): 1 - 102	February February; 17 (2): 103 - 291	March March; 17 (3): 293 - 517
April April; 17 (4): 519 - 761	May May; 17 (5): 763 - 904	June June; 17 (6): 905 - 1037
July July; 18 (1): 1 - 214	August August; 18 (2): 215 - 363	September September; 18 (3): 365 - 491
October October; 18 (4): 493 - 649	November November; 18 (5): 651 - 839	December December; 18 (6): 841 - 986