Issue #10 Jun 12, 1973 Issue #11 Mar 09, 1976 Issue #12 Oct 25, 1977 Issue #13 Jul 04, 1978 Issue #14 Oct 16, 1979 Issue #15 Jul 01, 1980 Issue #16 Jun 23, 1981 Issue #17 Aug 31, 1983 Issue #18 Oct 31, 1984 Issue #19 Aug 06, 1985 Issue #20 Aug 31, 1987 Issue #21 Jul 01, 1988 Issue #22 Jan 01, 1989 Issue #23 Jan 01, 1990 Issue #24 Apr 23, 1991 Issue #25 Jul 21, 1992 Issue #26 May 31, 1993 Issue #27 Apr 19, 1994 Issue #32 Jul 08, 2010 Issue #33 Jul 11, 2012