Nigeria.

v.1; v.1 1971-1972; v.2 1972; v.2 no.1-2 1972; v.3 1973; v.3-4 1973-74; v.4 1974; v.3-5 1973-1975; v.5 1975; v.6 no.1-6 1976; v.6 no.4 April 1976; v.6 no.5 May 1976; v.6 no.7-10 July-Oct.1976; v.6 no.7-9,12 1976; v.6 no.10 1976; v.6 no.11 November 1976; v.6 no.11 1976; v.7 no.1-3 Jan.-Mar. 1977; v.7 no.1-2,9-10 1977; v.7 no.4 April 1977; v.7 no.6 June 1977; v.7 no.8-11 Aug.-Nov. 1977; v.8 no.5 May 1978; v.8 no.5 1978; v.8 no.6 June 1978; v.8 no.6-10 1978; v.8 no.8-10 Aug.-Oct. 1978; v.8,no.9-12 1978; v.8 no.11 December 1978; v.9 no.1-5 Jan.-May 1979; v.9 no.1-4 1979; v.9 no.5-11 1979; v.9,no.7 1979; v.9 no.6-11 June-Nov. 1979; v.10 no.2 February 1980; v.10,no.2-3 1980; v.10 no.2-4 1980; v.10 no.3-4 Mar.-Apr. 1980; v.10,no.6-7 1980; v.10 no.6-9 1980; v.10 no.7 July 1980; v.10 no.9 Sept. 1980; v.10 no.10 Oct. 1980; v.10 no.10-12 1980; v.10,no.11 1980; v.10 no.12 December 1980; v.11 inc. 1981; v.11 no.1-3 Jan.-Mar. 1981; v.11 no.1-3 1981; v.11 no.4-5 Apr.-May 1981; v.11 no.4-5 1981; v.11,no.5 1981; v.11 no.6-7 1981; v.11 no.8-9 1981; v.11 no.10-12 1981; v.12 no.1 January 1982; v.12 no.1 1982; v.13 no.3 March 1983; v.13 no.3 1983; n.s. v.1 no.1 1986; n.s. v.1 no.2 1986; n.s. v.2 no.1 1987; n.s. v.1-3 1986-1988; n.s.,v.5-7 1990-1992; n.s.,v.8-9 1993-1994; n.s.,v.10-11 1995-1996; n.s.,v.12-14 1997-1999; n.s.,v.15,no.1 2000; n.s.,v.19 2004; n.s.,v.20,no.1-3 2005; n.s.,v.20,no.4 2005