1979: Vol. 13A, No. 1-6 1980: Vol. 14A, No. 1-2 1981: Vol. 15A, No. 1-4, 6 1982: Vol. 16A, No. 1-6 1983: Vol. 17A, No. 1-2 1984: Vol. 18A, No. 1-6 1985: Vol. 19A, No. 1-6 1986: Vol. 20A, No. 1 1987: Vol. 21A, No. 1-6 1988: Vol. 22A, No. 1-6 1989: Vol. 23A, No. 2-6 1990: Vol. 24A, No. 1-4, 6 1991: Vol. 25A, No. 1