Issue 75 May 1977  | Issue 95 November/December 1979  | Issue 103 June/August 1981  | Issue 104 November/December 1981  | Issue 105 January/February 1982  | Issue 107 May/June 1982  |
Issue 108 July/August 1982  | Issue 134 1987  | Issue 155 December 1993  | Issue 159 July/December 1995  |