Historical clue formulations

• Page 2, 4 or 6, generally — 2019-03-13
• Left page in a book — 2018-03-12
• It's left in a manuscript — 2015-09-19
• Recto's flip side — 2014-01-05
• Leaf part — 2014-01-04
• Left-hand page — 2011-08-10
• It's left in a book — 2010-05-15
• Left to the editor? — 2010-03-19
• Back of a leaf — 2007-10-06
• Left-hand page — 2002-12-05
• Left-hand page — 2001-04-13
• Page 2, usually — 1996-12-15