Issue #2 Jan 15, 1967 Issue #3 Aug 15, 1967 Issue #4 Dec 15, 1967 Issue #5 Jul 15, 1968 Issue #6 Sep 15, 1968 Issue #7 Nov 15, 1968 Issue #8 Jan 15, 1969 Issue #9 Feb 15, 1969 Issue #10 Apr 15, 1969 Issue #11 Jul 01, 1969 Issue #12 Aug 15, 1969 Issue #13 Oct 15, 1969 Issue #14 Dec 15, 1969 Issue #15 Mar 15, 1970 Issue #16 Jun 15, 1970 Issue #17 Jul 15, 1970 Issue #18 Dec 15, 1970 Issue #19 Jun 15, 1971 Issue #20 Sep 15, 1971 Issue #21 Aug 12, 1976