Interchange 1977 December Interchange No 1 1978 February Interchange No 2 1978 April Interchange 1978 July Interchange 1978 October Interchange 1978 December Interchange 1979 February Interchange 1979 May Interchange 1979 July Interchange 1979 September Interchange 1980 February Interchange 1980 June Interchange 1980 December Interchange 1981 February Interchange 1981 June Interchange 1981 August Interchange 1981 October Interchange 1981 December Interchange 1982 February Interchange 1982 April Interchange 1982 July Interchange 1982 September Interchange 1982 November Interchange 1982 November Interchange 1982 December Interchange 1983 February Interchange 1983 April Interchange 1983 Interchange (missing cover) 1984 April Interchange 1985 February Interchange 1986 December Interchange 1987 April Interchange 1987 Summer Interchange 1988 October Interchange 1988 Winter Interchange 1988 December Interchange 1989 Interchange
