Historical clue formulations

• Anonymous — 2017-08-18
• Anonymous — 2014-12-28
• Like a ghostwriter — 2009-01-28
• Anonymous — 2004-07-22
• Like some sources — 2003-09-27
• Like ghostwriters — 2002-09-27
• Not specified — 2000-09-25
• Left to the imagination — 1996-02-24