Issue #1 Feb 19, 1988 Issue #2 Dec 13, 1988 Issue #3 Jul 19, 1989 Issue #4 Mar 19, 1990 Issue #5 Jun 19, 1990 Issue #6 Feb 19, 1991 Issue #7 Aug 21, 1991 Issue #8 Feb 19, 1992 Issue #9 Jul 17, 1992 Issue #10 Feb 19, 1993 Issue #11 Aug 19, 1993 Issue #12 Dec 17, 1993 Issue #13 Aug 19, 1994 Issue #14 Mar 17, 1995 Issue #15 Aug 21, 1995 Issue #16 Feb 19, 1996 Issue #17 Sep 19, 1996 Issue #18 Jul 18, 1997 Issue #19 Nov 19, 1997 Issue #20