Historical clue formulations

• Small change — 2026-02-08
• Stainless steel element — 2019-11-08
• Small change — 2018-06-26
• Over three-quarters of bunsenite — 2011-05-01
• Where 67-Across's face appears — 2010-02-21
• Jefferson site — 2007-05-24
• Football defense that employs five defensive backs — 2006-07-28
• Coin with Monticello on its back — 2005-06-06
• Place for Jefferson — 1996-01-05
• Kind of plate — 1995-06-04
• Monticello site — 1994-09-16