Issue #306 Dec 01, 1971 Issue #401 Feb 01, 1972 Issue #402 Mar 01, 1972 Issue #403 May 01, 1972 Issue #404 Jul 01, 1972 Issue #405 Sep 01, 1972 Issue #406 Nov 01, 1972 Issue #501 Jan 01, 1973 Issue #502 Mar 01, 1973 Issue #503 May 01, 1973 Issue #504 Jul 01, 1973 Issue #505 Sep 01, 1973 Issue #506 Nov 01, 1973 Issue #601 Jan 01, 1974 Issue #602 Mar 01, 1974 Issue #603 May 01, 1974 Issue #604 Jul 01, 1974 Issue #605 Sep 01, 1974 Issue #606 Nov 01, 1974 Issue #701 Feb 01, 1975