1980
January January ; 27 (1) : 1 - 88	March March ; 27 (2) : 89 - 196	May May ; 27 (3) : 197 - 318
July July ; 27 (4) : 319 - 432	September September ; 27 (5) : 433 - 524	November November ; 27 (6) : 525 - 640