Issue #10 Apr 26, 1979 Issue #11 Sep 27, 1979 Issue #12 Oct 30, 1979 Issue #13 May 28, 1980 Issue #14 Dec 23, 1980 Issue #15 Jul 28, 1981 Issue #16 Jun 28, 1982 Issue #17 Aug 27, 1982 Issue #18 Nov 30, 1984 Issue #19 Dec 17, 1984 Issue #20 Sep 30, 1985 Issue #21 Jan 30, 1986 Issue #22 Jul 30, 1986 Issue #23 Mar 30, 1992 Issue #24 Apr 30, 1992 Issue #25 Jul 30, 1992 Issue #26 Apr 27, 1996 Issue #27 Sep 30, 1996 Issue #28 Apr 30, 1997 Issue #29 Jul 30, 1997