Issue #1 May 15, 1974 Issue #2 Jun 15, 1974 Issue #3 Jul 10, 1974 Issue #4 Nov 05, 1974 Issue #5 Apr 19, 1975 Issue #6 Aug 11, 1975 Issue #7 Dec 18, 1975 Issue #8 Apr 28, 1976 Issue #9 Sep 30, 1976 Issue #10 Mar 01, 1977 Issue #11 Aug 29, 1977 Issue #12 Mar 30, 1978 Issue #13 Sep 27, 1978 Issue #14 Jan 30, 1979 Issue #15 May 26, 1979 Issue #16 Dec 22, 1979 Issue #17 May 26, 1980 Issue #18 Jun 27, 1980 Issue #19 Oct 27, 1980 Issue #20 Feb 25, 1981