Historical clue formulations

• Namesakes of Perry's creator — 2006-12-29
• Film director Kenton and others — 2004-08-19
• Gardner and others — 2000-03-19
• Mystery writer Gardner et al. — 1999-02-01
• Gardner and others — 1998-12-27
• Author Gardner et al. — 1996-05-28
• Gardner and others — 1994-11-28