1991
January January ; 38 (1) : 1 - 140	March March ; 38 (2) : 145 - 263	April April ; 38 (3) : 267 - 418
May May ; 38 (4) : 421 - R144	July July ; 38 (5) : 549 - 688	September September ; 38 (6) : 693 - 802
October October ; 38 (7) : 805 - 946	November November ; 38 (8) : 951 - 1074