Director.

yr.1970 mo.JUL-DEC v.23 no.1-06; yr.1971 mo.JUL-DEC v.24 no.1-06; v.24 no.8-12 Feb-June 1972; v.25 no.1-5 July-Nov 1972; yr.1973 mo.JAN-JUN v.25 no.7-12; v.25 no.7-12 Jan-June 1973; yr.1973 mo.JUL-DEC v.26 no.1-06; v.26 no.1-6 July-Dec 1973; v.26 no.7-12 Jan-June 1974; yr.1974 mo.JUL-DEC v.27; v.27 no.1-6 July-Dec 1974; yr.1975 mo.JAN-JUN v.27; v.27 no.7-12 Jan-June 1975; yr.1975/76 v.28; v.28 July 1975-June 1976; yr.1976/77 v.29; v.29 July 1976-June 1977; yr.1977/78 v.30; v.30 July 1977-June 1978; yr.1978/79 v.31; v.31 July 1978-June 1979; yr.1979 mo.JUL-DEC v.32; v.32 no.1-6 July-Dec 1979; v.32 no.7-12 Jan-June 1980; yr.1980/81 v.33; v.33 July 1980-June 1981; v.34 no.1-6 July-Dec 1981; yr.1981/82 v.34; yr.1982/83 v.35; yr.1984 v.37; v.39:no.1-5 1985:Aug.-Dec.; v.39:no.6-12 1986:Jan.-July; v.40:no.1-6 1986:Aug.-1987:Jan.; v.41:no.12-13 1988:June-July; v.42:no.1-4 1988:Aug.-Nov.; v.42:no.5-8 1988:Dec.-1989:Mar.; v.42:no.9-12 1989:Apr.-July; v.43:no.2-4 1989:Sept.-Nov.; v.43:no.6-12 1990:Jan.-June; v.44:no.5-8 1990:Dec.-1991:March; v.44:no.9-12 1991:Apr.-July; v.45:no.1-4 1991:Aug.-Nov.; v.45:no.5-8 1991:Dec.-1992:Mar.; v.45:no.9-13 1992:Apr.-Aug.; v.46:no.2-6 1992:Sept.-1993:Jan.; v.48:no.1-5 1994:Aug.-Dec.; v.49:no.1-5 1995:Aug.-Dec.; v.49:no.6-12 1996:Jan.-July; v.50:no.1-5 1996:Aug.-Dec.; v.50:no.6-12 1997:Jan.-June; v.51:no.1-5 1997:Aug.-Dec.; v.51:no.6-12 1998:Jan.-July; v.52:no.6-12 1999:Jan.-July; v.53:no.1-5 1999:Aug.-Dec.; v.53:no.6-12 2000:Jan.-July; v.54:no.1-5 2000:Aug.-Dec.; v.54:no.6-12 2001:Jan.-July; v.55:no.1-5 2001:Aug.-Dec.; v.55:no.6-12 2002:Jan.-July; v.57:no.6-12 2004:Jan.-July; v.58:no.1-5 2004:Aug.-Dec.; v.58:no.6-12 2005:Jan.-July; v.59:no.1-5 2005:Aug.-Dec.; v.59:no.6-12 2006:Jan.-July; v.60:no.1-5 2006:Aug.-Dec.; v.60:no.6-12 2007:Jan.-July; v.61:no.1-5 2007:Aug.-Dec.; v.61:no.6-12 2008:Jan.-July; v.62 2008:Aug.-2009:July/Aug.; v.63:no.1-4 2009:Sept.-Dec.