Historical clue formulations

• Surviving — 2015-04-21
• Still around — 2011-11-10
• Not extinct — 2011-06-28
• Not lost — 2010-04-24
• Like seven of Sophocles' 123 plays — 2007-08-26
• Still around — 2003-07-03
• Surviving — 2000-05-01
• Not lost or destroyed — 1998-07-17
• Living — 1996-05-17