Issue #48 Dec 01, 1971 Issue #49 Feb 01, 1972 Issue #50 Apr 01, 1972 Issue #51 Jun 01, 1972 Issue #52 Aug 01, 1972 Issue #53 Sep 01, 1972 Issue #54 Dec 01, 1972 Issue #55 Feb 01, 1973 Issue #56 Apr 01, 1973 Issue #57 Jun 01, 1973 Issue #58 Aug 01, 1973 Issue #59 Oct 01, 1973 Issue #60 Mar 21, 1974 Issue #61 May 23, 1974 Issue #62 Jul 18, 1974 Issue #63 Oct 19, 1974 Issue #64 Dec 10, 1974 Issue #65 Mar 11, 1975 Issue #66 May 13, 1975 Issue #67 Jul 22, 1975