1991: Vol. 39, No. 1-12 1992: Vol. 40, No. 3-6, 8-12 1993: Vol. 41, No. 1, 2, 4, 5, 7-11 1994: Vol. 42, No. 1, 2, 3 1995: Vol. 43, No. 1-12 1996: Vol. 44, No. 1-4