Historical clue formulations

• Supplements — 2022-09-17
• They often get incorporated into the body — 2011-06-17
• Extras — 2010-08-13
• Tack-ons — 2007-01-29
• Extras — 2005-12-04
• Riders — 2005-06-19
• Supplements — 2003-11-12
• Supplementary material — 2003-02-01
• Dictionary section — 2001-12-14
• Supplemental material — 2001-06-10
• Extra pages, say — 2000-12-24
• End-of-book matter — 2000-02-10
• Back-of-the-book list — 1998-05-30
• Last-minute writings — 1996-10-06
• Afterthoughts — 1994-05-24