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Issues
- #15 February 1992 [795] 15 February 1992
- #15 January 1977 [17] 15 January 1977
- #15 January 1983 [322] 15 January 1983
- #15 July 1978 [95] 15 July 1978
- #15 July 1989 [661] 15 July 1989
- #15 June 1985 [448] 15 June 1985
- #15 June 1991 [761] 15 June 1991
- #15 March 1980 [179] 15 March 1980
- #15 March 1986 [487] 15 March 1986
- #15 May 1982 [287] 15 May 1982
- #15 November 1980 [209] 15 November 1980
- #15 November 1986 [522] 15 November 1986
- #15 October 1977 [56] 15 October 1977
- #15 October 1983 [361] 15 October 1983
- #15 October 1988 [622] 15 October 1988
- #15 September 1979 [153] 15 September 1979
- #15 September 1984 [409] 15 September 1984
- #15 September 1990 [722] 15 September 1990
- #16 April 1977 [30] 16 April 1977
- #16 April 1983 [335] 16 April 1983
- #16 April 1988 [596] 16 April 1988
- #16 August 1980 [196] 16 August 1980
- #16 August 1986 [509] 16 August 1986
- #16 December 1989 [683] 16 December 1989
- #16 February 1980 [175] 16 February 1980
- #16 February 1985 [431] 16 February 1985
- #16 February 1991 [744] 16 February 1991
- #16 January 1982 [270] 16 January 1982
- #16 January 1988 [583] 16 January 1988
- #16 January 1993 [842] 16 January 1993
- #16 July 1977 [43] 16 July 1977
- #16 July 1983 [348] 16 July 1983
- #16 July 1988 [609] 16 July 1988
- #16 June 1979 [140] 16 June 1979
- #16 June 1984 [396] 16 June 1984
- #16 June 1990 [709] 16 June 1990
- #16 March 1985 [435] 16 March 1985
- #16 March 1991 [748] 16 March 1991
- #16 May 1981 [235] 16 May 1981
- #16 May 1987 [548] 16 May 1987
- #16 May 1992 [808] 16 May 1992
- #16 November 1985 [470] 16 November 1985
- #16 November 1991 [783] 16 November 1991
- #16 October 1976 [4] 16 October 1976
- #16 October 1982 [309] 16 October 1982
- #16 September 1978 [104] 16 September 1978
- #16 September 1989 [670] 16 September 1989
- #17 April 1982 [283] 17 April 1982
- #17 August 1985 [457] 17 August 1985
- #17 August 1991 [770] 17 August 1991
- #17 December 1977 [65] 17 December 1977
- #17 December 1983 [370] 17 December 1983
- #17 December 1988 [631] 17 December 1988
- #17 February 1979 [123] 17 February 1979
- #17 February 1990 [692] 17 February 1990
- #17 January 1981 [218] 17 January 1981
- #17 January 1987 [531] 17 January 1987
- #17 July 1982 [296] 17 July 1982
- #17 June 1978 [91] 17 June 1978
- #17 June 1989 [657] 17 June 1989
- #17 March 1979 [127] 17 March 1979
- #17 March 1984 [383] 17 March 1984
- #17 March 1990 [696] 17 March 1990
- #17 May 1980 [188] 17 May 1980
- #17 May 1986 [496] 17 May 1986
- #17 November 1979 [162] 17 November 1979
- #17 November 1984 [418] 17 November 1984
- #17 November 1990 [731] 17 November 1990
- #17 October 1981 [257]+1 printing 17 October 1981
- #17 October 1987 [570] 17 October 1987
- #17 October 1992 [830] 17 October 1992
- #17 September 1977 [52] 17 September 1977
- #17 September 1983 [357] 17 September 1983
- #17 September 1988 [618] 17 September 1988
- #18 April 1981 [231] 18 April 1981
- #18 April 1987 [544] 18 April 1987
- #18 April 1992 [804] 18 April 1992
- #18 August 1979 [149] 18 August 1979
- #18 August 1984 [405] 18 August 1984
- #18 August 1990 [718] 18 August 1990
- #18 December 1976 [13] 18 December 1976
- #18 December 1982 [318] 18 December 1982
- #18 February 1978 [74] 18 February 1978
- #18 February 1984 [379] 18 February 1984
- #18 February 1989 [640] 18 February 1989
- #18 January 1986 [479] 18 January 1986
- #18 January 1992 [791] 18 January 1992
- #18 July 1981 [244] 18 July 1981
- #18 July 1987 [557] 18 July 1987
- #18 July 1992 [817] 18 July 1992
- #18 June 1977 [39] 18 June 1977
- #18 June 1983 [344] 18 June 1983
- #18 June 1988 [605] 18 June 1988
- #18 March 1978 [78] 18 March 1978
- #18 March 1989 [644] 18 March 1989
- #18 May 1985 [444] 18 May 1985
- #18 May 1991 [757] 18 May 1991
- #18 November 1978 [113] 18 November 1978
- #18 November 1989 [679] 18 November 1989
- #18 October 1980 [205] 18 October 1980