Issue #515 Nov 28, 1973 Issue #516 Dec 12, 1973 Issue #517 Dec 19, 1973 Issue #518 Jan 03, 1974 Issue #519 Issue #520 Issue #521 Feb 14, 1974 Issue #522 Feb 28, 1974 Issue #523 Mar 14, 1974 Issue #524 Mar 28, 1974 Issue #525 Apr 11, 1974 Issue #526 Apr 25, 1974 Issue #527 May 09, 1974 Issue #528 May 23, 1974 Issue #529 Issue #530 Jun 18, 1974 Issue #531 Issue #532 Jul 16, 1974 Issue #533 Jul 30, 1974 Issue #534