Issue #4 Aug 18, 1970 Issue #5 Aug 10, 1971 Issue #6 Aug 10, 1976 Issue #7 Aug 03, 1977 Issue #8 Oct 03, 1978 Issue #9 Jul 24, 1979 Issue #10 Aug 04, 1981 Issue #11 Aug 31, 1982 Issue #12 Sep 27, 1983 Issue #13 Jan 01, 1984 Issue #14 Jul 30, 1985 Issue #15 Jul 08, 1986 Issue #16 Jun 23, 1987 Issue #17 Jul 12, 1988 Issue #18 Jun 06, 1989 Issue #19 Jul 31, 1990 Issue #20 Jul 09, 1991 Issue #21 Jul 28, 1992 Issue #22 Mar 30, 1993 Issue #23 May 17, 1994