Issue #21 Feb 28, 1977 Issue #22 Jan 11, 1977 Issue #23 Mar 08, 1977 Issue #24 May 10, 1977 Issue #25 Jul 12, 1977 Issue #26 Sep 13, 1977 Issue #27 Nov 08, 1977 Issue #28 Jan 10, 1978 Issue #29 Mar 14, 1978 Issue #30 May 09, 1978 Issue #31 Jul 11, 1978 Issue #32 Sep 12, 1978 Issue #33 Feb 01, 1979 Issue #34 Jan 09, 1979 Issue #35 Mar 13, 1979 Issue #36 May 08, 1979 Issue #37 Jul 10, 1979 Issue #38 Dec 31, 1979 Issue #39 Feb 29, 1980 Issue #40 Apr 30, 1980