1977: Vol. 23, No. 1-6 1978: Vol. 24, No. 1-5 1979: Vol. 25, No. 1-4, 7 1980: Vol. 26, No. 1-2 1983: Vol. 29, No. 1-6 1984: Vol. 30, No. 1-2 1985: Vol. 31, No. 1-6 1986: Vol. 32, No. 1-3 1988: Vol. 34, No. 6 1989: Vol. 35, No. 1-6 1990: Vol. 36, No. 1-4, 6 1991: Vol. 37, No. 1-6 1992: Vol. 38, No. 1-4, 6 1993: Vol. 39, No. 2, 4, 6 1994: Vol. 40, No. 1 1995: Vol. 41, No. 1, 2, 3