1974
January January ; 21 (1) : 1 - 130	March March ; 21 (2) : 131 - 266	May May ; 21 (3) : 267 - 370
July July ; 21 (4) : 371 - 442	September September ; 21 (5) : 443 - 521	November November ; 21 (6) : 523 - 635