Issue #156 Feb 18, 1971 Issue #157 Apr 20, 1971 Issue #158 Jun 17, 1971 Issue #159 Aug 17, 1971 Issue #160 Oct 14, 1971 Issue #161 Dec 16, 1971 Issue #162 Feb 15, 1972 Issue #163 Apr 11, 1972 Issue #164 Jun 15, 1972 Issue #165 Aug 17, 1972 Issue #166 Oct 19, 1972 Issue #167 Dec 26, 1972 Issue #168 Jan 25, 1973 Issue #169 Feb 22, 1973 Issue #170 Mar 27, 1973 Issue #171 Apr 26, 1973 Issue #172 May 29, 1973 Issue #173 Jun 26, 1973 Issue #174 Jul 26, 1973 Issue #175 Aug 28, 1973