Issue #1 Sep 01, 1972 Issue #2 Nov 01, 1973 Issue #3 Jan 01, 1974 Issue #4 Mar 01, 1974 Issue #5 Issue #6 Issue #7 Issue #8 Jan 01, 1975 Issue #9 Apr 01, 1975 Issue #10 Jun 01, 1975 Issue #11 Jun 01, 1975 Issue #12 Nov 01, 1975 Issue #13 Jan 01, 1976 Issue #14 Apr 01, 1976 Issue #15 Jun 01, 1976 Issue #16 Aug 01, 1976 Issue #17 Nov 01, 1976 Issue #18 Jan 01, 1977 Issue #19 Apr 01, 1977 Issue #20 Jul 01, 1977