Issue #630 Issue #631 Issue #632 Issue #633 Apr 07, 1978 Issue #634 Apr 21, 1978 Issue #635 May 05, 1978 Issue #636 May 19, 1978 Issue #637 Jun 02, 1978 Issue #638 Jun 16, 1978 Issue #639 Jun 30, 1978 Issue #640 Jul 14, 1978 Issue #641 Jul 28, 1978 Issue #642 Aug 11, 1978 Issue #643 Aug 25, 1978 Issue #644 Sep 08, 1978 Issue #645 Sep 22, 1978 Issue #646 Oct 06, 1978 Issue #647 Issue #648 Issue #649